thr3ads.net - Linux Virtualization - [PATCH v2] i2c: virtio: add a virtio i2c frontend driver [Sep 2020]

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Andy Shevchenko

2020-Sep-14 15:24 UTC

[PATCH v2] i2c: virtio: add a virtio i2c frontend driver

On Mon, Sep 14, 2020 at 05:48:07PM +0300, Dan Carpenter
wrote:> Hi Jie,
> 
> url:   
https://github.com/0day-ci/linux/commits/Jie-Deng/i2c-virtio-add-a-virtio-i2c-frontend-driver/20200911-115013
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux.git
i2c/for-next
> config: parisc-randconfig-m031-20200913 (attached as .config)
> compiler: hppa-linux-gcc (GCC) 9.3.0
> 
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp at intel.com>
> Reported-by: Dan Carpenter <dan.carpenter at oracle.com>
> 
> smatch warnings:
> drivers/i2c/busses/i2c-virtio.c:160 virtio_i2c_xfer() error: we previously
assumed 'vmsg' could be null (see line 137)
> 
It's quite possible a false positive. Look at 122. But I agree that for-loop
is
not the best for such things to understand. Perhaps switching to do {} while ()
will make it better.
> #
https://github.com/0day-ci/linux/commit/0a54ec771966748fcbc86256b830b5f786168b7d
> git remote add linux-review https://github.com/0day-ci/linux
> git fetch --no-tags linux-review
Jie-Deng/i2c-virtio-add-a-virtio-i2c-frontend-driver/20200911-115013
> git checkout 0a54ec771966748fcbc86256b830b5f786168b7d
> vim +/vmsg +160 drivers/i2c/busses/i2c-virtio.c
> 
> 0a54ec77196674 Jie Deng 2020-09-11  109  static int virtio_i2c_xfer(struct
i2c_adapter *adap, struct i2c_msg *msgs, int num)
> 0a54ec77196674 Jie Deng 2020-09-11  110  {
> 0a54ec77196674 Jie Deng 2020-09-11  111  	struct virtio_i2c *vi =
i2c_get_adapdata(adap);
> 0a54ec77196674 Jie Deng 2020-09-11  112  	struct virtqueue *vq = vi->vq;
> 0a54ec77196674 Jie Deng 2020-09-11  113  	struct virtio_i2c_msg *vmsg;
> 0a54ec77196674 Jie Deng 2020-09-11  114  	unsigned long time_left;
> 0a54ec77196674 Jie Deng 2020-09-11  115  	int len, i, ret = 0;
> 0a54ec77196674 Jie Deng 2020-09-11  116  
> 0a54ec77196674 Jie Deng 2020-09-11  117  	mutex_lock(&vi->i2c_lock);
> 0a54ec77196674 Jie Deng 2020-09-11  118  	vmsg = &vi->vmsg;
> 0a54ec77196674 Jie Deng 2020-09-11  119  	vmsg->buf = NULL;
> 0a54ec77196674 Jie Deng 2020-09-11  120  
> 0a54ec77196674 Jie Deng 2020-09-11  121  	for (i = 0; i < num; i++) {
> 0a54ec77196674 Jie Deng 2020-09-11  122  		ret = virtio_i2c_add_msg(vq,
vmsg, &msgs[i]);
> 0a54ec77196674 Jie Deng 2020-09-11  123  		if (ret) {
> 0a54ec77196674 Jie Deng 2020-09-11  124  			dev_err(&adap->dev,
"failed to add msg[%d] to virtqueue.\n", i);
> 0a54ec77196674 Jie Deng 2020-09-11  125  			break;
> 0a54ec77196674 Jie Deng 2020-09-11  126  		}
> 0a54ec77196674 Jie Deng 2020-09-11  127  
> 0a54ec77196674 Jie Deng 2020-09-11  128  		virtqueue_kick(vq);
> 0a54ec77196674 Jie Deng 2020-09-11  129  
> 0a54ec77196674 Jie Deng 2020-09-11  130  		time_left =
wait_for_completion_timeout(&vi->completion, adap->timeout);
> 0a54ec77196674 Jie Deng 2020-09-11  131  		if (!time_left) {
> 0a54ec77196674 Jie Deng 2020-09-11  132  			dev_err(&adap->dev,
"msg[%d]: addr=0x%x timeout.\n", i, msgs[i].addr);
> 0a54ec77196674 Jie Deng 2020-09-11  133  			break;
> 0a54ec77196674 Jie Deng 2020-09-11  134  		}
> 0a54ec77196674 Jie Deng 2020-09-11  135  
> 0a54ec77196674 Jie Deng 2020-09-11  136  		vmsg = (struct virtio_i2c_msg
*)virtqueue_get_buf(vq, &len);
> 0a54ec77196674 Jie Deng 2020-09-11 @137  		if (vmsg) {
>                                                             ^^^^
> Check for NULL.
> 
> 0a54ec77196674 Jie Deng 2020-09-11  138  			/* vmsg should point to the
same address with &vi->vmsg */
> 0a54ec77196674 Jie Deng 2020-09-11  139  			if (vmsg != &vi->vmsg) {
> 0a54ec77196674 Jie Deng 2020-09-11  140  				dev_err(&adap->dev,
"msg[%d]: addr=0x%x virtqueue error.\n",
> 0a54ec77196674 Jie Deng 2020-09-11  141  					i,
le16_to_cpu(vmsg->hdr.addr));
> 0a54ec77196674 Jie Deng 2020-09-11  142  				break;
> 0a54ec77196674 Jie Deng 2020-09-11  143  			}
> 0a54ec77196674 Jie Deng 2020-09-11  144  			if (vmsg->status !=
VIRTIO_I2C_MSG_OK) {
> 0a54ec77196674 Jie Deng 2020-09-11  145  				dev_err(&adap->dev,
"msg[%d]: addr=0x%x error=%d.\n",
> 0a54ec77196674 Jie Deng 2020-09-11  146  					i,
le16_to_cpu(vmsg->hdr.addr), vmsg->status);
> 0a54ec77196674 Jie Deng 2020-09-11  147  				break;
> 0a54ec77196674 Jie Deng 2020-09-11  148  			}
> 0a54ec77196674 Jie Deng 2020-09-11  149  			if ((msgs[i].flags &
I2C_M_RD) && msgs[i].len)
> 0a54ec77196674 Jie Deng 2020-09-11  150  				memcpy(msgs[i].buf,
vmsg->buf, msgs[i].len);
> 0a54ec77196674 Jie Deng 2020-09-11  151  
> 0a54ec77196674 Jie Deng 2020-09-11  152  			kfree(vmsg->buf);
> 0a54ec77196674 Jie Deng 2020-09-11  153  			vmsg->buf = NULL;
> 0a54ec77196674 Jie Deng 2020-09-11  154  		}
> 0a54ec77196674 Jie Deng 2020-09-11  155  
> 0a54ec77196674 Jie Deng 2020-09-11  156  	
reinit_completion(&vi->completion);
> 0a54ec77196674 Jie Deng 2020-09-11  157  	}
> 0a54ec77196674 Jie Deng 2020-09-11  158  
> 0a54ec77196674 Jie Deng 2020-09-11  159  
mutex_unlock(&vi->i2c_lock);
> 0a54ec77196674 Jie Deng 2020-09-11 @160  	kfree(vmsg->buf);
>                                                       ^^^^^^^^^
> Unchecked dereference.
> 
> 0a54ec77196674 Jie Deng 2020-09-11  161  	return ((ret < 0) ? ret : i);
> 0a54ec77196674 Jie Deng 2020-09-11  162  }
> 
> ---
> 0-DAY CI Kernel Test Service, Intel Corporation
> https://lists.01.org/hyperkitty/list/kbuild-all at lists.01.org


-- 
With Best Regards,
Andy Shevchenko

Dan Carpenter

2020-Sep-14 15:47 UTC

head link

[PATCH v2] i2c: virtio: add a virtio i2c frontend driver

On Mon, Sep 14, 2020 at 06:24:55PM +0300, Andy Shevchenko
wrote:> On Mon, Sep 14, 2020 at 05:48:07PM +0300, Dan Carpenter wrote:
> > Hi Jie,
> > 
> > url:   
https://github.com/0day-ci/linux/commits/Jie-Deng/i2c-virtio-add-a-virtio-i2c-frontend-driver/20200911-115013
> > base:   https://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux.git 
i2c/for-next
> > config: parisc-randconfig-m031-20200913 (attached as .config)
> > compiler: hppa-linux-gcc (GCC) 9.3.0
> > 
> > If you fix the issue, kindly add following tag as appropriate
> > Reported-by: kernel test robot <lkp at intel.com>
> > Reported-by: Dan Carpenter <dan.carpenter at oracle.com>
> > 
> > smatch warnings:
> > drivers/i2c/busses/i2c-virtio.c:160 virtio_i2c_xfer() error: we
previously assumed 'vmsg' could be null (see line 137)
> > 
> 
> It's quite possible a false positive. Look at 122. But I agree that
for-loop is
> not the best for such things to understand. Perhaps switching to do {}
while ()
> will make it better.
> 
Smatch is assuming that virtqueue_get_buf() can return NULL on the last
iteration through the loop.

regards,
dan carpenter

> > #
https://github.com/0day-ci/linux/commit/0a54ec771966748fcbc86256b830b5f786168b7d
> > git remote add linux-review https://github.com/0day-ci/linux 
> > git fetch --no-tags linux-review
Jie-Deng/i2c-virtio-add-a-virtio-i2c-frontend-driver/20200911-115013
> > git checkout 0a54ec771966748fcbc86256b830b5f786168b7d
> > vim +/vmsg +160 drivers/i2c/busses/i2c-virtio.c
> > 
> > 0a54ec77196674 Jie Deng 2020-09-11  109  static int
virtio_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
> > 0a54ec77196674 Jie Deng 2020-09-11  110  {
> > 0a54ec77196674 Jie Deng 2020-09-11  111  	struct virtio_i2c *vi =
i2c_get_adapdata(adap);
> > 0a54ec77196674 Jie Deng 2020-09-11  112  	struct virtqueue *vq =
vi->vq;
> > 0a54ec77196674 Jie Deng 2020-09-11  113  	struct virtio_i2c_msg *vmsg;
> > 0a54ec77196674 Jie Deng 2020-09-11  114  	unsigned long time_left;
> > 0a54ec77196674 Jie Deng 2020-09-11  115  	int len, i, ret = 0;
> > 0a54ec77196674 Jie Deng 2020-09-11  116  
> > 0a54ec77196674 Jie Deng 2020-09-11  117  
mutex_lock(&vi->i2c_lock);
> > 0a54ec77196674 Jie Deng 2020-09-11  118  	vmsg = &vi->vmsg;
> > 0a54ec77196674 Jie Deng 2020-09-11  119  	vmsg->buf = NULL;
> > 0a54ec77196674 Jie Deng 2020-09-11  120  
> > 0a54ec77196674 Jie Deng 2020-09-11  121  	for (i = 0; i < num; i++)
{
> > 0a54ec77196674 Jie Deng 2020-09-11  122  		ret =
virtio_i2c_add_msg(vq, vmsg, &msgs[i]);
> > 0a54ec77196674 Jie Deng 2020-09-11  123  		if (ret) {
> > 0a54ec77196674 Jie Deng 2020-09-11  124  			dev_err(&adap->dev,
"failed to add msg[%d] to virtqueue.\n", i);
> > 0a54ec77196674 Jie Deng 2020-09-11  125  			break;
> > 0a54ec77196674 Jie Deng 2020-09-11  126  		}
> > 0a54ec77196674 Jie Deng 2020-09-11  127  
> > 0a54ec77196674 Jie Deng 2020-09-11  128  		virtqueue_kick(vq);
> > 0a54ec77196674 Jie Deng 2020-09-11  129  
> > 0a54ec77196674 Jie Deng 2020-09-11  130  		time_left =
wait_for_completion_timeout(&vi->completion, adap->timeout);
> > 0a54ec77196674 Jie Deng 2020-09-11  131  		if (!time_left) {
> > 0a54ec77196674 Jie Deng 2020-09-11  132  			dev_err(&adap->dev,
"msg[%d]: addr=0x%x timeout.\n", i, msgs[i].addr);
> > 0a54ec77196674 Jie Deng 2020-09-11  133  			break;
> > 0a54ec77196674 Jie Deng 2020-09-11  134  		}
> > 0a54ec77196674 Jie Deng 2020-09-11  135  
> > 0a54ec77196674 Jie Deng 2020-09-11  136  		vmsg = (struct
virtio_i2c_msg *)virtqueue_get_buf(vq, &len);
> > 0a54ec77196674 Jie Deng 2020-09-11 @137  		if (vmsg) {
> >                                                             ^^^^
> > Check for NULL.
> > 
> > 0a54ec77196674 Jie Deng 2020-09-11  138  			/* vmsg should point to
the same address with &vi->vmsg */
> > 0a54ec77196674 Jie Deng 2020-09-11  139  			if (vmsg !=
&vi->vmsg) {
> > 0a54ec77196674 Jie Deng 2020-09-11  140  			
dev_err(&adap->dev, "msg[%d]: addr=0x%x virtqueue error.\n",
> > 0a54ec77196674 Jie Deng 2020-09-11  141  					i,
le16_to_cpu(vmsg->hdr.addr));
> > 0a54ec77196674 Jie Deng 2020-09-11  142  				break;
> > 0a54ec77196674 Jie Deng 2020-09-11  143  			}
> > 0a54ec77196674 Jie Deng 2020-09-11  144  			if (vmsg->status !=
VIRTIO_I2C_MSG_OK) {
> > 0a54ec77196674 Jie Deng 2020-09-11  145  			
dev_err(&adap->dev, "msg[%d]: addr=0x%x error=%d.\n",
> > 0a54ec77196674 Jie Deng 2020-09-11  146  					i,
le16_to_cpu(vmsg->hdr.addr), vmsg->status);
> > 0a54ec77196674 Jie Deng 2020-09-11  147  				break;
> > 0a54ec77196674 Jie Deng 2020-09-11  148  			}
> > 0a54ec77196674 Jie Deng 2020-09-11  149  			if ((msgs[i].flags &
I2C_M_RD) && msgs[i].len)
> > 0a54ec77196674 Jie Deng 2020-09-11  150  				memcpy(msgs[i].buf,
vmsg->buf, msgs[i].len);
> > 0a54ec77196674 Jie Deng 2020-09-11  151  
> > 0a54ec77196674 Jie Deng 2020-09-11  152  			kfree(vmsg->buf);
> > 0a54ec77196674 Jie Deng 2020-09-11  153  			vmsg->buf = NULL;
> > 0a54ec77196674 Jie Deng 2020-09-11  154  		}
> > 0a54ec77196674 Jie Deng 2020-09-11  155  
> > 0a54ec77196674 Jie Deng 2020-09-11  156  	
reinit_completion(&vi->completion);
> > 0a54ec77196674 Jie Deng 2020-09-11  157  	}
> > 0a54ec77196674 Jie Deng 2020-09-11  158  
> > 0a54ec77196674 Jie Deng 2020-09-11  159  
mutex_unlock(&vi->i2c_lock);
> > 0a54ec77196674 Jie Deng 2020-09-11 @160  	kfree(vmsg->buf);
> >                                                       ^^^^^^^^^
> > Unchecked dereference.
> > 
> > 0a54ec77196674 Jie Deng 2020-09-11  161  	return ((ret < 0) ? ret :
i);
> > 0a54ec77196674 Jie Deng 2020-09-11  162  }
> > 
> > ---
> > 0-DAY CI Kernel Test Service, Intel Corporation
> > https://lists.01.org/hyperkitty/list/kbuild-all at lists.01.org 
> 
> 
> 
> -- 
> With Best Regards,
> Andy Shevchenko
>

Andy Shevchenko

2020-Sep-14 16:08 UTC

head link

[PATCH v2] i2c: virtio: add a virtio i2c frontend driver

On Mon, Sep 14, 2020 at 06:47:27PM +0300, Dan Carpenter
wrote:> On Mon, Sep 14, 2020 at 06:24:55PM +0300, Andy Shevchenko wrote:
> > On Mon, Sep 14, 2020 at 05:48:07PM +0300, Dan Carpenter wrote:
> > > Hi Jie,
> > > 
> > > url:   
https://github.com/0day-ci/linux/commits/Jie-Deng/i2c-virtio-add-a-virtio-i2c-frontend-driver/20200911-115013
> > > base:  
https://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux.git  i2c/for-next
> > > config: parisc-randconfig-m031-20200913 (attached as .config)
> > > compiler: hppa-linux-gcc (GCC) 9.3.0
> > > 
> > > If you fix the issue, kindly add following tag as appropriate
> > > Reported-by: kernel test robot <lkp at intel.com>
> > > Reported-by: Dan Carpenter <dan.carpenter at oracle.com>
> > > 
> > > smatch warnings:
> > > drivers/i2c/busses/i2c-virtio.c:160 virtio_i2c_xfer() error: we
previously assumed 'vmsg' could be null (see line 137)
> > > 
> > 
> > It's quite possible a false positive. Look at 122. But I agree
that for-loop is
> > not the best for such things to understand. Perhaps switching to do {}
while ()
> > will make it better.
> > 
> 
> Smatch is assuming that virtqueue_get_buf() can return NULL on the last
> iteration through the loop.
I see now. Thanks.
> > > #
https://github.com/0day-ci/linux/commit/0a54ec771966748fcbc86256b830b5f786168b7d
> > > git remote add linux-review https://github.com/0day-ci/linux 
> > > git fetch --no-tags linux-review
Jie-Deng/i2c-virtio-add-a-virtio-i2c-frontend-driver/20200911-115013
> > > git checkout 0a54ec771966748fcbc86256b830b5f786168b7d
> > > vim +/vmsg +160 drivers/i2c/busses/i2c-virtio.c
> > > 
> > > 0a54ec77196674 Jie Deng 2020-09-11  109  static int
virtio_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
> > > 0a54ec77196674 Jie Deng 2020-09-11  110  {
> > > 0a54ec77196674 Jie Deng 2020-09-11  111  	struct virtio_i2c *vi =
i2c_get_adapdata(adap);
> > > 0a54ec77196674 Jie Deng 2020-09-11  112  	struct virtqueue *vq =
vi->vq;
> > > 0a54ec77196674 Jie Deng 2020-09-11  113  	struct virtio_i2c_msg
*vmsg;
> > > 0a54ec77196674 Jie Deng 2020-09-11  114  	unsigned long
time_left;
> > > 0a54ec77196674 Jie Deng 2020-09-11  115  	int len, i, ret = 0;
> > > 0a54ec77196674 Jie Deng 2020-09-11  116  
> > > 0a54ec77196674 Jie Deng 2020-09-11  117  
mutex_lock(&vi->i2c_lock);
> > > 0a54ec77196674 Jie Deng 2020-09-11  118  	vmsg =
&vi->vmsg;
> > > 0a54ec77196674 Jie Deng 2020-09-11  119  	vmsg->buf = NULL;
> > > 0a54ec77196674 Jie Deng 2020-09-11  120  
> > > 0a54ec77196674 Jie Deng 2020-09-11  121  	for (i = 0; i < num;
i++) {
> > > 0a54ec77196674 Jie Deng 2020-09-11  122  		ret =
virtio_i2c_add_msg(vq, vmsg, &msgs[i]);
> > > 0a54ec77196674 Jie Deng 2020-09-11  123  		if (ret) {
> > > 0a54ec77196674 Jie Deng 2020-09-11  124  		
dev_err(&adap->dev, "failed to add msg[%d] to virtqueue.\n",
i);
> > > 0a54ec77196674 Jie Deng 2020-09-11  125  			break;
> > > 0a54ec77196674 Jie Deng 2020-09-11  126  		}
> > > 0a54ec77196674 Jie Deng 2020-09-11  127  
> > > 0a54ec77196674 Jie Deng 2020-09-11  128  		virtqueue_kick(vq);
> > > 0a54ec77196674 Jie Deng 2020-09-11  129  
> > > 0a54ec77196674 Jie Deng 2020-09-11  130  		time_left =
wait_for_completion_timeout(&vi->completion, adap->timeout);
> > > 0a54ec77196674 Jie Deng 2020-09-11  131  		if (!time_left) {
> > > 0a54ec77196674 Jie Deng 2020-09-11  132  		
dev_err(&adap->dev, "msg[%d]: addr=0x%x timeout.\n", i,
msgs[i].addr);
> > > 0a54ec77196674 Jie Deng 2020-09-11  133  			break;
> > > 0a54ec77196674 Jie Deng 2020-09-11  134  		}
> > > 0a54ec77196674 Jie Deng 2020-09-11  135  
> > > 0a54ec77196674 Jie Deng 2020-09-11  136  		vmsg = (struct
virtio_i2c_msg *)virtqueue_get_buf(vq, &len);
> > > 0a54ec77196674 Jie Deng 2020-09-11 @137  		if (vmsg) {
> > >                                                             ^^^^
> > > Check for NULL.
> > > 
> > > 0a54ec77196674 Jie Deng 2020-09-11  138  			/* vmsg should point
to the same address with &vi->vmsg */
> > > 0a54ec77196674 Jie Deng 2020-09-11  139  			if (vmsg !=
&vi->vmsg) {
> > > 0a54ec77196674 Jie Deng 2020-09-11  140  			
dev_err(&adap->dev, "msg[%d]: addr=0x%x virtqueue error.\n",
> > > 0a54ec77196674 Jie Deng 2020-09-11  141  					i,
le16_to_cpu(vmsg->hdr.addr));
> > > 0a54ec77196674 Jie Deng 2020-09-11  142  				break;
> > > 0a54ec77196674 Jie Deng 2020-09-11  143  			}
> > > 0a54ec77196674 Jie Deng 2020-09-11  144  			if (vmsg->status
!= VIRTIO_I2C_MSG_OK) {
> > > 0a54ec77196674 Jie Deng 2020-09-11  145  			
dev_err(&adap->dev, "msg[%d]: addr=0x%x error=%d.\n",
> > > 0a54ec77196674 Jie Deng 2020-09-11  146  					i,
le16_to_cpu(vmsg->hdr.addr), vmsg->status);
> > > 0a54ec77196674 Jie Deng 2020-09-11  147  				break;
> > > 0a54ec77196674 Jie Deng 2020-09-11  148  			}
> > > 0a54ec77196674 Jie Deng 2020-09-11  149  			if ((msgs[i].flags
& I2C_M_RD) && msgs[i].len)
> > > 0a54ec77196674 Jie Deng 2020-09-11  150  				memcpy(msgs[i].buf,
vmsg->buf, msgs[i].len);
> > > 0a54ec77196674 Jie Deng 2020-09-11  151  
> > > 0a54ec77196674 Jie Deng 2020-09-11  152  			kfree(vmsg->buf);
> > > 0a54ec77196674 Jie Deng 2020-09-11  153  			vmsg->buf = NULL;
> > > 0a54ec77196674 Jie Deng 2020-09-11  154  		}
> > > 0a54ec77196674 Jie Deng 2020-09-11  155  
> > > 0a54ec77196674 Jie Deng 2020-09-11  156  	
reinit_completion(&vi->completion);
> > > 0a54ec77196674 Jie Deng 2020-09-11  157  	}
> > > 0a54ec77196674 Jie Deng 2020-09-11  158  
> > > 0a54ec77196674 Jie Deng 2020-09-11  159  
mutex_unlock(&vi->i2c_lock);
> > > 0a54ec77196674 Jie Deng 2020-09-11 @160  	kfree(vmsg->buf);
> > >                                                       ^^^^^^^^^
> > > Unchecked dereference.
> > > 
> > > 0a54ec77196674 Jie Deng 2020-09-11  161  	return ((ret < 0) ?
ret : i);
> > > 0a54ec77196674 Jie Deng 2020-09-11  162  }
> > > 
> > > ---
> > > 0-DAY CI Kernel Test Service, Intel Corporation
> > > https://lists.01.org/hyperkitty/list/kbuild-all at lists.01.org 
> > 
> > 
> > 
> > -- 
> > With Best Regards,
> > Andy Shevchenko
> > 
-- 
With Best Regards,
Andy Shevchenko

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Linux Virtualization - Sep 2020 - [PATCH v2] i2c: virtio: add a virtio i2c frontend driver

[PATCH v2] i2c: virtio: add a virtio i2c frontend driver

[PATCH v2] i2c: virtio: add a virtio i2c frontend driver

[PATCH v2] i2c: virtio: add a virtio i2c frontend driver

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