Yang Yingliang
2021-Aug-09 13:20 UTC
[Bridge] [PATCH net v3] net: bridge: fix memleak in br_add_if()
I got a memleak report:
BUG: memory leak
unreferenced object 0x607ee521a658 (size 240):
comm "syz-executor.0", pid 955, jiffies 4294780569 (age 16.449s)
hex dump (first 32 bytes, cpu 1):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace:
[<00000000d830ea5a>] br_multicast_add_port+0x1c2/0x300
net/bridge/br_multicast.c:1693
[<00000000274d9a71>] new_nbp net/bridge/br_if.c:435 [inline]
[<00000000274d9a71>] br_add_if+0x670/0x1740 net/bridge/br_if.c:611
[<0000000012ce888e>] do_set_master net/core/rtnetlink.c:2513 [inline]
[<0000000012ce888e>] do_set_master+0x1aa/0x210 net/core/rtnetlink.c:2487
[<0000000099d1cafc>] __rtnl_newlink+0x1095/0x13e0
net/core/rtnetlink.c:3457
[<00000000a01facc0>] rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3488
[<00000000acc9186c>] rtnetlink_rcv_msg+0x369/0xa10
net/core/rtnetlink.c:5550
[<00000000d4aabb9c>] netlink_rcv_skb+0x134/0x3d0
net/netlink/af_netlink.c:2504
[<00000000bc2e12a3>] netlink_unicast_kernel net/netlink/af_netlink.c:1314
[inline]
[<00000000bc2e12a3>] netlink_unicast+0x4a0/0x6a0
net/netlink/af_netlink.c:1340
[<00000000e4dc2d0e>] netlink_sendmsg+0x789/0xc70
net/netlink/af_netlink.c:1929
[<000000000d22c8b3>] sock_sendmsg_nosec net/socket.c:654 [inline]
[<000000000d22c8b3>] sock_sendmsg+0x139/0x170 net/socket.c:674
[<00000000e281417a>] ____sys_sendmsg+0x658/0x7d0 net/socket.c:2350
[<00000000237aa2ab>] ___sys_sendmsg+0xf8/0x170 net/socket.c:2404
[<000000004f2dc381>] __sys_sendmsg+0xd3/0x190 net/socket.c:2433
[<0000000005feca6c>] do_syscall_64+0x37/0x90 arch/x86/entry/common.c:47
[<000000007304477d>] entry_SYSCALL_64_after_hwframe+0x44/0xae
On error path of br_add_if(), p->mcast_stats allocated in
new_nbp() need be freed, or it will be leaked.
Fixes: 1080ab95e3c7 ("net: bridge: add support for IGMP/MLD stats and
export them via netlink")
Reported-by: Hulk Robot <hulkci at huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang at huawei.com>
---
v3:
use br_multicast_del_port() to free mcast_stats
---
net/bridge/br_if.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/net/bridge/br_if.c b/net/bridge/br_if.c
index 5aa508a08a691..b5fb2b682e191 100644
--- a/net/bridge/br_if.c
+++ b/net/bridge/br_if.c
@@ -604,6 +604,7 @@ int br_add_if(struct net_bridge *br, struct net_device *dev,
err = dev_set_allmulti(dev, 1);
if (err) {
+ br_multicast_del_port(p);
kfree(p); /* kobject not yet init'd, manually free */
goto err1;
}
@@ -708,6 +709,7 @@ int br_add_if(struct net_bridge *br, struct net_device *dev,
err3:
sysfs_remove_link(br->ifobj, p->dev->name);
err2:
+ br_multicast_del_port(p);
kobject_put(&p->kobj);
dev_set_allmulti(dev, -1);
err1:
--
2.25.1
Nikolay Aleksandrov
2021-Aug-09 15:43 UTC
[Bridge] [PATCH net v3] net: bridge: fix memleak in br_add_if()
On 09/08/2021 16:20, Yang Yingliang wrote:> I got a memleak report: > > BUG: memory leak > unreferenced object 0x607ee521a658 (size 240): > comm "syz-executor.0", pid 955, jiffies 4294780569 (age 16.449s) > hex dump (first 32 bytes, cpu 1): > 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > backtrace: > [<00000000d830ea5a>] br_multicast_add_port+0x1c2/0x300 net/bridge/br_multicast.c:1693 > [<00000000274d9a71>] new_nbp net/bridge/br_if.c:435 [inline] > [<00000000274d9a71>] br_add_if+0x670/0x1740 net/bridge/br_if.c:611 > [<0000000012ce888e>] do_set_master net/core/rtnetlink.c:2513 [inline] > [<0000000012ce888e>] do_set_master+0x1aa/0x210 net/core/rtnetlink.c:2487 > [<0000000099d1cafc>] __rtnl_newlink+0x1095/0x13e0 net/core/rtnetlink.c:3457 > [<00000000a01facc0>] rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3488 > [<00000000acc9186c>] rtnetlink_rcv_msg+0x369/0xa10 net/core/rtnetlink.c:5550 > [<00000000d4aabb9c>] netlink_rcv_skb+0x134/0x3d0 net/netlink/af_netlink.c:2504 > [<00000000bc2e12a3>] netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] > [<00000000bc2e12a3>] netlink_unicast+0x4a0/0x6a0 net/netlink/af_netlink.c:1340 > [<00000000e4dc2d0e>] netlink_sendmsg+0x789/0xc70 net/netlink/af_netlink.c:1929 > [<000000000d22c8b3>] sock_sendmsg_nosec net/socket.c:654 [inline] > [<000000000d22c8b3>] sock_sendmsg+0x139/0x170 net/socket.c:674 > [<00000000e281417a>] ____sys_sendmsg+0x658/0x7d0 net/socket.c:2350 > [<00000000237aa2ab>] ___sys_sendmsg+0xf8/0x170 net/socket.c:2404 > [<000000004f2dc381>] __sys_sendmsg+0xd3/0x190 net/socket.c:2433 > [<0000000005feca6c>] do_syscall_64+0x37/0x90 arch/x86/entry/common.c:47 > [<000000007304477d>] entry_SYSCALL_64_after_hwframe+0x44/0xae > > On error path of br_add_if(), p->mcast_stats allocated in > new_nbp() need be freed, or it will be leaked. > > Fixes: 1080ab95e3c7 ("net: bridge: add support for IGMP/MLD stats and export them via netlink") > Reported-by: Hulk Robot <hulkci at huawei.com> > Signed-off-by: Yang Yingliang <yangyingliang at huawei.com> > --- > v3: > use br_multicast_del_port() to free mcast_stats > --- > net/bridge/br_if.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/net/bridge/br_if.c b/net/bridge/br_if.c > index 5aa508a08a691..b5fb2b682e191 100644 > --- a/net/bridge/br_if.c > +++ b/net/bridge/br_if.c > @@ -604,6 +604,7 @@ int br_add_if(struct net_bridge *br, struct net_device *dev, > > err = dev_set_allmulti(dev, 1); > if (err) { > + br_multicast_del_port(p); > kfree(p); /* kobject not yet init'd, manually free */ > goto err1; > } > @@ -708,6 +709,7 @@ int br_add_if(struct net_bridge *br, struct net_device *dev, > err3: > sysfs_remove_link(br->ifobj, p->dev->name); > err2: > + br_multicast_del_port(p); > kobject_put(&p->kobj); > dev_set_allmulti(dev, -1); > err1: >I currently cannot test it, but it looks good to me. Acked-by: Nikolay Aleksandrov <nikolay at nvidia.com>
patchwork-bot+netdevbpf at kernel.org
2021-Aug-10 20:30 UTC
[Bridge] [PATCH net v3] net: bridge: fix memleak in br_add_if()
Hello: This patch was applied to netdev/net.git (refs/heads/master): On Mon, 9 Aug 2021 21:20:23 +0800 you wrote:> I got a memleak report: > > BUG: memory leak > unreferenced object 0x607ee521a658 (size 240): > comm "syz-executor.0", pid 955, jiffies 4294780569 (age 16.449s) > hex dump (first 32 bytes, cpu 1): > 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > backtrace: > [<00000000d830ea5a>] br_multicast_add_port+0x1c2/0x300 net/bridge/br_multicast.c:1693 > [<00000000274d9a71>] new_nbp net/bridge/br_if.c:435 [inline] > [<00000000274d9a71>] br_add_if+0x670/0x1740 net/bridge/br_if.c:611 > [<0000000012ce888e>] do_set_master net/core/rtnetlink.c:2513 [inline] > [<0000000012ce888e>] do_set_master+0x1aa/0x210 net/core/rtnetlink.c:2487 > [<0000000099d1cafc>] __rtnl_newlink+0x1095/0x13e0 net/core/rtnetlink.c:3457 > [<00000000a01facc0>] rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3488 > [<00000000acc9186c>] rtnetlink_rcv_msg+0x369/0xa10 net/core/rtnetlink.c:5550 > [<00000000d4aabb9c>] netlink_rcv_skb+0x134/0x3d0 net/netlink/af_netlink.c:2504 > [<00000000bc2e12a3>] netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] > [<00000000bc2e12a3>] netlink_unicast+0x4a0/0x6a0 net/netlink/af_netlink.c:1340 > [<00000000e4dc2d0e>] netlink_sendmsg+0x789/0xc70 net/netlink/af_netlink.c:1929 > [<000000000d22c8b3>] sock_sendmsg_nosec net/socket.c:654 [inline] > [<000000000d22c8b3>] sock_sendmsg+0x139/0x170 net/socket.c:674 > [<00000000e281417a>] ____sys_sendmsg+0x658/0x7d0 net/socket.c:2350 > [<00000000237aa2ab>] ___sys_sendmsg+0xf8/0x170 net/socket.c:2404 > [<000000004f2dc381>] __sys_sendmsg+0xd3/0x190 net/socket.c:2433 > [<0000000005feca6c>] do_syscall_64+0x37/0x90 arch/x86/entry/common.c:47 > [<000000007304477d>] entry_SYSCALL_64_after_hwframe+0x44/0xae > > [...]Here is the summary with links: - [net,v3] net: bridge: fix memleak in br_add_if() https://git.kernel.org/netdev/net/c/519133debcc1 You are awesome, thank you! -- Deet-doot-dot, I am a bot. https://korg.docs.kernel.org/patchwork/pwbot.html