Jani Nikula (4):
drm/amdgpu: fix -Wformat-truncation warning in
amdgpu_gfx_kiq_init_ring()
drm/nouveau: fix -Wformat-truncation warning in
nouveau_backlight_init()
drm/imx: fix -Wformat-truncation warning in imx_ldb_probe()
drm: enable -Wformat-truncation across the subsystem
drivers/gpu/drm/Makefile | 3 +--
drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c | 6 ++++--
drivers/gpu/drm/imx/ipuv3/imx-ldb.c | 6 +++++-
drivers/gpu/drm/nouveau/nouveau_backlight.c | 9 +++++++--
4 files changed, 17 insertions(+), 7 deletions(-)
--
2.39.2
Jani Nikula
2024-May-23 15:51 UTC
[PATCH 1/4] drm/amdgpu: fix -Wformat-truncation warning in amdgpu_gfx_kiq_init_ring()
Enabling -Wformat-truncation yields the following warning:
../drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c: In function
?amdgpu_gfx_kiq_init_ring?:
../drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c:332:61: error: ?%d? directive output
may be truncated writing between 1 and 10 bytes into a region of size between 0
and 8 [-Werror=format-truncation=]
332 | snprintf(ring->name, sizeof(ring->name),
"kiq_%d.%d.%d.%d",
| ^~
../drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c:332:50: note: directive argument in
the range [0, 2147483647]
332 | snprintf(ring->name, sizeof(ring->name),
"kiq_%d.%d.%d.%d",
| ^~~~~~~~~~~~~~~~~
../drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c:332:9: note: ?snprintf? output
between 12 and 41 bytes into a destination of size 16
332 | snprintf(ring->name, sizeof(ring->name),
"kiq_%d.%d.%d.%d",
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
333 | xcc_id, ring->me, ring->pipe, ring->queue);
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Silence the warning by checking the snprintf() return value.
Signed-off-by: Jani Nikula <jani.nikula at intel.com>
---
Cc: Alex Deucher <alexander.deucher at amd.com>
Cc: "Christian K?nig" <christian.koenig at amd.com>
Cc: Pan Xinhui <Xinhui.Pan at amd.com>
Cc: amd-gfx at lists.freedesktop.org
Cc: dri-devel at lists.freedesktop.org
---
drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c
b/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c
index 1d955652f3ba..92744d0d2c10 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c
@@ -329,8 +329,10 @@ int amdgpu_gfx_kiq_init_ring(struct amdgpu_device *adev,
int xcc_id)
ring->eop_gpu_addr = kiq->eop_gpu_addr;
ring->no_scheduler = true;
- snprintf(ring->name, sizeof(ring->name), "kiq_%d.%d.%d.%d",
- xcc_id, ring->me, ring->pipe, ring->queue);
+ r = snprintf(ring->name, sizeof(ring->name),
"kiq_%d.%d.%d.%d",
+ xcc_id, ring->me, ring->pipe, ring->queue);
+ if (r >= sizeof(ring->name))
+ dev_warn(adev->dev, "kiq ring name truncated\n");
r = amdgpu_ring_init(adev, ring, 1024, irq, AMDGPU_CP_KIQ_IRQ_DRIVER0,
AMDGPU_RING_PRIO_DEFAULT, NULL);
if (r)
--
2.39.2
Jani Nikula
2024-May-23 15:51 UTC
[PATCH 2/4] drm/nouveau: fix -Wformat-truncation warning in nouveau_backlight_init()
Enabling -Wformat-truncation yields the following warning:
../drivers/gpu/drm/nouveau/nouveau_backlight.c: In function
?nouveau_backlight_init?:
../drivers/gpu/drm/nouveau/nouveau_backlight.c:56:69: error: ?%d? directive
output may be truncated writing between 1 and 10 bytes into a region of size 3
[-Werror=format-truncation=]
56 | snprintf(backlight_name, BL_NAME_SIZE,
"nv_backlight%d", nb);
| ^~
In function ?nouveau_get_backlight_name?,
inlined from ?nouveau_backlight_init? at
../drivers/gpu/drm/nouveau/nouveau_backlight.c:351:7:
../drivers/gpu/drm/nouveau/nouveau_backlight.c:56:56: note: directive argument
in the range [1, 2147483647]
56 | snprintf(backlight_name, BL_NAME_SIZE,
"nv_backlight%d", nb);
| ^~~~~~~~~~~~~~~~
../drivers/gpu/drm/nouveau/nouveau_backlight.c:56:17: note: ?snprintf? output
between 14 and 23 bytes into a destination of size 15
56 | snprintf(backlight_name, BL_NAME_SIZE,
"nv_backlight%d", nb);
|
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Silence the warning by checking the snprintf() return value.
Signed-off-by: Jani Nikula <jani.nikula at intel.com>
---
Cc: Karol Herbst <kherbst at redhat.com>
Cc: Lyude Paul <lyude at redhat.com>
Cc: Danilo Krummrich <dakr at redhat.com>
Cc: dri-devel at lists.freedesktop.org
Cc: nouveau at lists.freedesktop.org
---
drivers/gpu/drm/nouveau/nouveau_backlight.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/nouveau/nouveau_backlight.c
b/drivers/gpu/drm/nouveau/nouveau_backlight.c
index d47442125fa1..1d77a5f280c5 100644
--- a/drivers/gpu/drm/nouveau/nouveau_backlight.c
+++ b/drivers/gpu/drm/nouveau/nouveau_backlight.c
@@ -49,13 +49,18 @@ nouveau_get_backlight_name(char
backlight_name[BL_NAME_SIZE],
struct nouveau_backlight *bl)
{
const int nb = ida_alloc_max(&bl_ida, 99, GFP_KERNEL);
+ int ret;
if (nb < 0)
return false;
if (nb > 0)
- snprintf(backlight_name, BL_NAME_SIZE, "nv_backlight%d", nb);
+ ret = snprintf(backlight_name, BL_NAME_SIZE, "nv_backlight%d", nb);
else
- snprintf(backlight_name, BL_NAME_SIZE, "nv_backlight");
+ ret = snprintf(backlight_name, BL_NAME_SIZE, "nv_backlight");
+
+ if (ret >= BL_NAME_SIZE)
+ return false;
+
bl->id = nb;
return true;
}
--
2.39.2
Jani Nikula
2024-May-23 15:51 UTC
[PATCH 3/4] drm/imx: fix -Wformat-truncation warning in imx_ldb_probe()
Enabling -Wformat-truncation yields the following warning:
../drivers/gpu/drm/imx/ipuv3/imx-ldb.c: In function ?imx_ldb_probe?:
../drivers/gpu/drm/imx/ipuv3/imx-ldb.c:658:57: error: ?_sel? directive output
may be truncated writing 4 bytes into a region of size between 3 and 13
[-Werror=format-truncation=]
658 | snprintf(clkname, sizeof(clkname), "di%d_sel",
i);
| ^~~~
../drivers/gpu/drm/imx/ipuv3/imx-ldb.c:658:17: note: ?snprintf? output between 8
and 18 bytes into a destination of size 16
658 | snprintf(clkname, sizeof(clkname), "di%d_sel",
i);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Silence the warning by checking the snprintf() return value.
Signed-off-by: Jani Nikula <jani.nikula at intel.com>
---
Cc: Philipp Zabel <p.zabel at pengutronix.de>
Cc: Shawn Guo <shawnguo at kernel.org>
Cc: Sascha Hauer <s.hauer at pengutronix.de>
Cc: Pengutronix Kernel Team <kernel at pengutronix.de>
Cc: Fabio Estevam <festevam at gmail.com>
Cc: dri-devel at lists.freedesktop.org
Cc: imx at lists.linux.dev
---
drivers/gpu/drm/imx/ipuv3/imx-ldb.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/imx/ipuv3/imx-ldb.c
b/drivers/gpu/drm/imx/ipuv3/imx-ldb.c
index 71d70194fcbd..46f779fe60ee 100644
--- a/drivers/gpu/drm/imx/ipuv3/imx-ldb.c
+++ b/drivers/gpu/drm/imx/ipuv3/imx-ldb.c
@@ -654,8 +654,12 @@ static int imx_ldb_probe(struct platform_device *pdev)
*/
for (i = 0; i < 4; i++) {
char clkname[16];
+ int len;
+
+ len = snprintf(clkname, sizeof(clkname), "di%d_sel", i);
+ if (len >= sizeof(clkname))
+ dev_err(dev, "clkname truncated\n");
- snprintf(clkname, sizeof(clkname), "di%d_sel", i);
imx_ldb->clk_sel[i] = devm_clk_get(imx_ldb->dev, clkname);
if (IS_ERR(imx_ldb->clk_sel[i])) {
ret = PTR_ERR(imx_ldb->clk_sel[i]);
--
2.39.2
Jani Nikula
2024-May-23 15:51 UTC
[PATCH 4/4] drm: enable -Wformat-truncation across the subsystem
With the -Wformat-truncation warnings fixed, finish the job started in
commit a61ddb4393ad ("drm: enable (most) W=1 warnings by default across
the subsystem"), and enable that warning too.
Signed-off-by: Jani Nikula <jani.nikula at intel.com>
---
Gut feeling says there are more issues, and my configs just don't catch
them all, but let's see what the build bots have to say. ;)
---
drivers/gpu/drm/Makefile | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
index 68cc9258ffc4..644613dbedda 100644
--- a/drivers/gpu/drm/Makefile
+++ b/drivers/gpu/drm/Makefile
@@ -16,8 +16,7 @@ subdir-ccflags-y += $(call cc-option,
-Wunused-but-set-variable)
subdir-ccflags-y += $(call cc-option, -Wunused-const-variable)
subdir-ccflags-y += $(call cc-option, -Wpacked-not-aligned)
subdir-ccflags-y += $(call cc-option, -Wformat-overflow)
-# FIXME: fix -Wformat-truncation warnings and uncomment
-#subdir-ccflags-y += $(call cc-option, -Wformat-truncation)
+subdir-ccflags-y += $(call cc-option, -Wformat-truncation)
subdir-ccflags-y += $(call cc-option, -Wstringop-truncation)
# The following turn off the warnings enabled by -Wextra
ifeq ($(findstring 2, $(KBUILD_EXTRA_WARN)),)
--
2.39.2
Apparently Analagous Threads
- [PATCH 3/4] drm/imx: fix -Wformat-truncation warning in imx_ldb_probe()
- [PATCH 3/4] drm/imx: fix -Wformat-truncation warning in imx_ldb_probe()
- [PATCH 1/4] drm/amdgpu: fix -Wformat-truncation warning in amdgpu_gfx_kiq_init_ring()
- [PATCH 1/2] nouveau/bl: Assign different names to interfaces
- [PATCH 0/2] drm/nouveau: Fix panic on nouveau unload.