We have to check pointer before usage.
Reported-by: Andrey Karpov karpov@viva64.com Signed-off-by: Andy Shevchenko andy.shevchenko@gmail.com --- drivers/gpu/drm/nouveau/core/subdev/clock/base.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/nouveau/core/subdev/clock/base.c b/drivers/gpu/drm/nouveau/core/subdev/clock/base.c index e51b72d..2e84436 100644 --- a/drivers/gpu/drm/nouveau/core/subdev/clock/base.c +++ b/drivers/gpu/drm/nouveau/core/subdev/clock/base.c @@ -322,7 +322,6 @@ nouveau_pstate_new(struct nouveau_clock *clk, int idx) return 0;
pstate = kzalloc(sizeof(*pstate), GFP_KERNEL); - cstate = &pstate->base; if (!pstate) return -ENOMEM;
@@ -330,6 +329,9 @@ nouveau_pstate_new(struct nouveau_clock *clk, int idx)
pstate->pstate = perfE.pstate; pstate->fanspeed = perfE.fanspeed; + + cstate = &pstate->base; + cstate->voltage = perfE.voltage; cstate->domain[nv_clk_src_core] = perfE.core; cstate->domain[nv_clk_src_shader] = perfE.shader;
On Wed, Jan 7, 2015 at 5:29 PM, Andy Shevchenko andy.shevchenko@gmail.com wrote:
We have to check pointer before usage.
Reported-by: Andrey Karpov karpov@viva64.com Signed-off-by: Andy Shevchenko andy.shevchenko@gmail.com
drivers/gpu/drm/nouveau/core/subdev/clock/base.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/nouveau/core/subdev/clock/base.c b/drivers/gpu/drm/nouveau/core/subdev/clock/base.c index e51b72d..2e84436 100644 --- a/drivers/gpu/drm/nouveau/core/subdev/clock/base.c +++ b/drivers/gpu/drm/nouveau/core/subdev/clock/base.c @@ -322,7 +322,6 @@ nouveau_pstate_new(struct nouveau_clock *clk, int idx) return 0;
pstate = kzalloc(sizeof(*pstate), GFP_KERNEL);
cstate = &pstate->base;
What's wrong with this line? If pstate == NULL, &pstate->base == NULL as well and we return.
if (!pstate) return -ENOMEM;@@ -330,6 +329,9 @@ nouveau_pstate_new(struct nouveau_clock *clk, int idx)
pstate->pstate = perfE.pstate; pstate->fanspeed = perfE.fanspeed;
cstate = &pstate->base;cstate->voltage = perfE.voltage; cstate->domain[nv_clk_src_core] = perfE.core; cstate->domain[nv_clk_src_shader] = perfE.shader;-- 1.8.3.101.g727a46b
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On 01/08/2015 10:45 AM, Ilia Mirkin wrote:
On Wed, Jan 7, 2015 at 5:29 PM, Andy Shevchenko andy.shevchenko@gmail.com wrote:
We have to check pointer before usage.
Reported-by: Andrey Karpov karpov@viva64.com Signed-off-by: Andy Shevchenko andy.shevchenko@gmail.com
drivers/gpu/drm/nouveau/core/subdev/clock/base.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/nouveau/core/subdev/clock/base.c b/drivers/gpu/drm/nouveau/core/subdev/clock/base.c index e51b72d..2e84436 100644 --- a/drivers/gpu/drm/nouveau/core/subdev/clock/base.c +++ b/drivers/gpu/drm/nouveau/core/subdev/clock/base.c @@ -322,7 +322,6 @@ nouveau_pstate_new(struct nouveau_clock *clk, int idx) return 0;
pstate = kzalloc(sizeof(*pstate), GFP_KERNEL);
cstate = &pstate->base;What's wrong with this line? If pstate == NULL, &pstate->base == NULL as well and we return.
If pstate == NULL (kzalloc returned NULL), pstate->base triggers a null pointer deference error?
Thanks, Vince
if (!pstate) return -ENOMEM;@@ -330,6 +329,9 @@ nouveau_pstate_new(struct nouveau_clock *clk, int idx)
pstate->pstate = perfE.pstate; pstate->fanspeed = perfE.fanspeed;
cstate = &pstate->base;cstate->voltage = perfE.voltage; cstate->domain[nv_clk_src_core] = perfE.core; cstate->domain[nv_clk_src_shader] = perfE.shader;-- 1.8.3.101.g727a46b
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On Wed, Jan 7, 2015 at 11:32 PM, Vince Hsu vinceh@nvidia.com wrote:
On 01/08/2015 10:45 AM, Ilia Mirkin wrote:
On Wed, Jan 7, 2015 at 5:29 PM, Andy Shevchenko andy.shevchenko@gmail.com wrote:
We have to check pointer before usage.
Reported-by: Andrey Karpov karpov@viva64.com Signed-off-by: Andy Shevchenko andy.shevchenko@gmail.com
drivers/gpu/drm/nouveau/core/subdev/clock/base.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/nouveau/core/subdev/clock/base.c b/drivers/gpu/drm/nouveau/core/subdev/clock/base.c index e51b72d..2e84436 100644 --- a/drivers/gpu/drm/nouveau/core/subdev/clock/base.c +++ b/drivers/gpu/drm/nouveau/core/subdev/clock/base.c @@ -322,7 +322,6 @@ nouveau_pstate_new(struct nouveau_clock *clk, int idx) return 0;
pstate = kzalloc(sizeof(*pstate), GFP_KERNEL);
cstate = &pstate->base;What's wrong with this line? If pstate == NULL, &pstate->base == NULL as well and we return.
If pstate == NULL (kzalloc returned NULL), pstate->base triggers a null pointer deference error?
Where do you see "pstate->base"? I only see "&pstate->base" which merely computes an offset into a structure... No reason to dereference pstate.
-ilia
On 01/08/2015 12:57 PM, Ilia Mirkin wrote:
On Wed, Jan 7, 2015 at 11:32 PM, Vince Hsu vinceh@nvidia.com wrote:
On 01/08/2015 10:45 AM, Ilia Mirkin wrote:
On Wed, Jan 7, 2015 at 5:29 PM, Andy Shevchenko andy.shevchenko@gmail.com wrote:
We have to check pointer before usage.
Reported-by: Andrey Karpov karpov@viva64.com Signed-off-by: Andy Shevchenko andy.shevchenko@gmail.com
drivers/gpu/drm/nouveau/core/subdev/clock/base.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/nouveau/core/subdev/clock/base.c b/drivers/gpu/drm/nouveau/core/subdev/clock/base.c index e51b72d..2e84436 100644 --- a/drivers/gpu/drm/nouveau/core/subdev/clock/base.c +++ b/drivers/gpu/drm/nouveau/core/subdev/clock/base.c @@ -322,7 +322,6 @@ nouveau_pstate_new(struct nouveau_clock *clk, int idx) return 0;
pstate = kzalloc(sizeof(*pstate), GFP_KERNEL);
cstate = &pstate->base;What's wrong with this line? If pstate == NULL, &pstate->base == NULL as well and we return.
If pstate == NULL (kzalloc returned NULL), pstate->base triggers a null pointer deference error?
Where do you see "pstate->base"? I only see "&pstate->base" which merely computes an offset into a structure... No reason to dereference pstate.
Sorry that I don't quite understand. We do need deference pstate to get the member base which has type nouveau_cstate, and then assign the address of base to cstate for later use.
struct nouveau_pstate { struct list_head head; struct list_head list; /* c-states */ struct nouveau_cstate base; u8 pstate; u8 fanspeed; };
Thanks, Vince
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On Thu, Jan 8, 2015 at 12:40 AM, Vince Hsu vinceh@nvidia.com wrote:
On 01/08/2015 12:57 PM, Ilia Mirkin wrote:
On Wed, Jan 7, 2015 at 11:32 PM, Vince Hsu vinceh@nvidia.com wrote:
On 01/08/2015 10:45 AM, Ilia Mirkin wrote:
On Wed, Jan 7, 2015 at 5:29 PM, Andy Shevchenko andy.shevchenko@gmail.com wrote:
We have to check pointer before usage.
Reported-by: Andrey Karpov karpov@viva64.com Signed-off-by: Andy Shevchenko andy.shevchenko@gmail.com
drivers/gpu/drm/nouveau/core/subdev/clock/base.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/nouveau/core/subdev/clock/base.c b/drivers/gpu/drm/nouveau/core/subdev/clock/base.c index e51b72d..2e84436 100644 --- a/drivers/gpu/drm/nouveau/core/subdev/clock/base.c +++ b/drivers/gpu/drm/nouveau/core/subdev/clock/base.c @@ -322,7 +322,6 @@ nouveau_pstate_new(struct nouveau_clock *clk, int idx) return 0;
pstate = kzalloc(sizeof(*pstate), GFP_KERNEL);
cstate = &pstate->base;What's wrong with this line? If pstate == NULL, &pstate->base == NULL as well and we return.
If pstate == NULL (kzalloc returned NULL), pstate->base triggers a null pointer deference error?
Where do you see "pstate->base"? I only see "&pstate->base" which merely computes an offset into a structure... No reason to dereference pstate.
Sorry that I don't quite understand. We do need deference pstate to get the member base which has type nouveau_cstate, and then assign the address of base to cstate for later use.
struct nouveau_pstate { struct list_head head; struct list_head list; /* c-states */ struct nouveau_cstate base; u8 pstate; u8 fanspeed; };
&pstate->base is the same thing as
(void *)pstate + offsetof(struct nouveau_pstate, base)
At no point is pstate dereferenced. In fact, take a look at
http://en.wikipedia.org/wiki/Offsetof
which says that the traditional implementation of offsetof is
#define offsetof(st, m) ((size_t)(&((st *)0)->m))
Cheers,
-ilia
On 01/08/2015 01:52 PM, Ilia Mirkin wrote:
On Thu, Jan 8, 2015 at 12:40 AM, Vince Hsu vinceh@nvidia.com wrote:
On 01/08/2015 12:57 PM, Ilia Mirkin wrote:
On Wed, Jan 7, 2015 at 11:32 PM, Vince Hsu vinceh@nvidia.com wrote:
On 01/08/2015 10:45 AM, Ilia Mirkin wrote:
On Wed, Jan 7, 2015 at 5:29 PM, Andy Shevchenko andy.shevchenko@gmail.com wrote:
We have to check pointer before usage.
Reported-by: Andrey Karpov karpov@viva64.com Signed-off-by: Andy Shevchenko andy.shevchenko@gmail.com
drivers/gpu/drm/nouveau/core/subdev/clock/base.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)diff --git a/drivers/gpu/drm/nouveau/core/subdev/clock/base.c b/drivers/gpu/drm/nouveau/core/subdev/clock/base.c index e51b72d..2e84436 100644 --- a/drivers/gpu/drm/nouveau/core/subdev/clock/base.c +++ b/drivers/gpu/drm/nouveau/core/subdev/clock/base.c @@ -322,7 +322,6 @@ nouveau_pstate_new(struct nouveau_clock *clk, int idx) return 0;
pstate = kzalloc(sizeof(*pstate), GFP_KERNEL);
cstate = &pstate->base;What's wrong with this line? If pstate == NULL, &pstate->base == NULL as well and we return.
If pstate == NULL (kzalloc returned NULL), pstate->base triggers a null pointer deference error?
Where do you see "pstate->base"? I only see "&pstate->base" which merely computes an offset into a structure... No reason to dereference pstate.
Sorry that I don't quite understand. We do need deference pstate to get the member base which has type nouveau_cstate, and then assign the address of base to cstate for later use.
struct nouveau_pstate { struct list_head head; struct list_head list; /* c-states */ struct nouveau_cstate base; u8 pstate; u8 fanspeed; };
&pstate->base is the same thing as
(void *)pstate + offsetof(struct nouveau_pstate, base)
At no point is pstate dereferenced. In fact, take a look at
http://en.wikipedia.org/wiki/Offsetof
which says that the traditional implementation of offsetof is
#define offsetof(st, m) ((size_t)(&((st *)0)->m))
Oh I got your point. You're absolutely right. Thanks for the patience. :)
Vince
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dri-devel@lists.freedesktop.org
-
Andy Shevchenko -
Ilia Mirkin -
Vince Hsu