* [PATCH v2] drm/amdkfd: Fix potential NULL pointer dereferences
@ 2018-01-10 23:15 Gustavo A. R. Silva
2018-01-11 14:40 ` Oded Gabbay
0 siblings, 1 reply; 3+ messages in thread
From: Gustavo A. R. Silva @ 2018-01-10 23:15 UTC (permalink / raw)
To: Felix Kuehling, Oded Gabbay, Alex Deucher, Christian König,
David Airlie
Cc: dri-devel, amd-gfx, linux-kernel, Gustavo A. R. Silva
In case kfd_get_process_device_data returns null, there are some
null pointer dereferences in functions kfd_bind_processes_to_device
and kfd_unbind_processes_from_device.
Fix this by printing a WARN_ON for PDDs that aren't found and skip
them with continue statements.
Addresses-Coverity-ID: 1463794 ("Dereference null return value")
Addresses-Coverity-ID: 1463772 ("Dereference null return value")
Suggested-by: Felix Kuehling <felix.kuehling@amd.com>
Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com>
---
Changes in v2:
Print a WARN_ON and skip PDDs that aren't found instead of returning
an error.
drivers/gpu/drm/amd/amdkfd/kfd_process.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_process.c b/drivers/gpu/drm/amd/amdkfd/kfd_process.c
index a22fb071..4ff5f0f 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_process.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_process.c
@@ -461,7 +461,8 @@ int kfd_bind_processes_to_device(struct kfd_dev *dev)
hash_for_each_rcu(kfd_processes_table, temp, p, kfd_processes) {
mutex_lock(&p->mutex);
pdd = kfd_get_process_device_data(dev, p);
- if (pdd->bound != PDD_BOUND_SUSPENDED) {
+
+ if (WARN_ON(!pdd) || pdd->bound != PDD_BOUND_SUSPENDED) {
mutex_unlock(&p->mutex);
continue;
}
@@ -501,6 +502,11 @@ void kfd_unbind_processes_from_device(struct kfd_dev *dev)
mutex_lock(&p->mutex);
pdd = kfd_get_process_device_data(dev, p);
+ if (WARN_ON(!pdd)) {
+ mutex_unlock(&p->mutex);
+ continue;
+ }
+
if (pdd->bound == PDD_BOUND)
pdd->bound = PDD_BOUND_SUSPENDED;
mutex_unlock(&p->mutex);
--
2.7.4
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: [PATCH v2] drm/amdkfd: Fix potential NULL pointer dereferences
2018-01-10 23:15 [PATCH v2] drm/amdkfd: Fix potential NULL pointer dereferences Gustavo A. R. Silva
@ 2018-01-11 14:40 ` Oded Gabbay
2018-01-11 17:42 ` Gustavo A. R. Silva
0 siblings, 1 reply; 3+ messages in thread
From: Oded Gabbay @ 2018-01-11 14:40 UTC (permalink / raw)
To: Gustavo A. R. Silva
Cc: Felix Kuehling, Alex Deucher, Christian König, David Airlie,
Maling list - DRI developers, amd-gfx list,
Linux-Kernel@Vger. Kernel. Org
On Thu, Jan 11, 2018 at 1:15 AM, Gustavo A. R. Silva
<garsilva@embeddedor.com> wrote:
> In case kfd_get_process_device_data returns null, there are some
> null pointer dereferences in functions kfd_bind_processes_to_device
> and kfd_unbind_processes_from_device.
>
> Fix this by printing a WARN_ON for PDDs that aren't found and skip
> them with continue statements.
>
> Addresses-Coverity-ID: 1463794 ("Dereference null return value")
> Addresses-Coverity-ID: 1463772 ("Dereference null return value")
> Suggested-by: Felix Kuehling <felix.kuehling@amd.com>
> Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com>
> ---
> Changes in v2:
> Print a WARN_ON and skip PDDs that aren't found instead of returning
> an error.
>
> drivers/gpu/drm/amd/amdkfd/kfd_process.c | 8 +++++++-
> 1 file changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_process.c b/drivers/gpu/drm/amd/amdkfd/kfd_process.c
> index a22fb071..4ff5f0f 100644
> --- a/drivers/gpu/drm/amd/amdkfd/kfd_process.c
> +++ b/drivers/gpu/drm/amd/amdkfd/kfd_process.c
> @@ -461,7 +461,8 @@ int kfd_bind_processes_to_device(struct kfd_dev *dev)
> hash_for_each_rcu(kfd_processes_table, temp, p, kfd_processes) {
> mutex_lock(&p->mutex);
> pdd = kfd_get_process_device_data(dev, p);
> - if (pdd->bound != PDD_BOUND_SUSPENDED) {
> +
> + if (WARN_ON(!pdd) || pdd->bound != PDD_BOUND_SUSPENDED) {
> mutex_unlock(&p->mutex);
> continue;
> }
> @@ -501,6 +502,11 @@ void kfd_unbind_processes_from_device(struct kfd_dev *dev)
> mutex_lock(&p->mutex);
> pdd = kfd_get_process_device_data(dev, p);
>
> + if (WARN_ON(!pdd)) {
> + mutex_unlock(&p->mutex);
> + continue;
> + }
> +
> if (pdd->bound == PDD_BOUND)
> pdd->bound = PDD_BOUND_SUSPENDED;
> mutex_unlock(&p->mutex);
> --
> 2.7.4
>
This patch is:
Reviewed-by: Oded Gabbay <oded.gabbay@gmail.com>
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: [PATCH v2] drm/amdkfd: Fix potential NULL pointer dereferences
2018-01-11 14:40 ` Oded Gabbay
@ 2018-01-11 17:42 ` Gustavo A. R. Silva
0 siblings, 0 replies; 3+ messages in thread
From: Gustavo A. R. Silva @ 2018-01-11 17:42 UTC (permalink / raw)
To: Oded Gabbay
Cc: Felix Kuehling, Alex Deucher, Christian König, David Airlie,
Maling list - DRI developers, amd-gfx list,
Linux-Kernel@Vger. Kernel. Org
Quoting Oded Gabbay <oded.gabbay@gmail.com>:
> On Thu, Jan 11, 2018 at 1:15 AM, Gustavo A. R. Silva
> <garsilva@embeddedor.com> wrote:
>> In case kfd_get_process_device_data returns null, there are some
>> null pointer dereferences in functions kfd_bind_processes_to_device
>> and kfd_unbind_processes_from_device.
>>
>> Fix this by printing a WARN_ON for PDDs that aren't found and skip
>> them with continue statements.
>>
>> Addresses-Coverity-ID: 1463794 ("Dereference null return value")
>> Addresses-Coverity-ID: 1463772 ("Dereference null return value")
>> Suggested-by: Felix Kuehling <felix.kuehling@amd.com>
>> Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com>
>> ---
>> Changes in v2:
>> Print a WARN_ON and skip PDDs that aren't found instead of returning
>> an error.
>>
>> drivers/gpu/drm/amd/amdkfd/kfd_process.c | 8 +++++++-
>> 1 file changed, 7 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_process.c
>> b/drivers/gpu/drm/amd/amdkfd/kfd_process.c
>> index a22fb071..4ff5f0f 100644
>> --- a/drivers/gpu/drm/amd/amdkfd/kfd_process.c
>> +++ b/drivers/gpu/drm/amd/amdkfd/kfd_process.c
>> @@ -461,7 +461,8 @@ int kfd_bind_processes_to_device(struct kfd_dev *dev)
>> hash_for_each_rcu(kfd_processes_table, temp, p, kfd_processes) {
>> mutex_lock(&p->mutex);
>> pdd = kfd_get_process_device_data(dev, p);
>> - if (pdd->bound != PDD_BOUND_SUSPENDED) {
>> +
>> + if (WARN_ON(!pdd) || pdd->bound != PDD_BOUND_SUSPENDED) {
>> mutex_unlock(&p->mutex);
>> continue;
>> }
>> @@ -501,6 +502,11 @@ void kfd_unbind_processes_from_device(struct
>> kfd_dev *dev)
>> mutex_lock(&p->mutex);
>> pdd = kfd_get_process_device_data(dev, p);
>>
>> + if (WARN_ON(!pdd)) {
>> + mutex_unlock(&p->mutex);
>> + continue;
>> + }
>> +
>> if (pdd->bound == PDD_BOUND)
>> pdd->bound = PDD_BOUND_SUSPENDED;
>> mutex_unlock(&p->mutex);
>> --
>> 2.7.4
>>
> This patch is:
> Reviewed-by: Oded Gabbay <oded.gabbay@gmail.com>
Thank you, Oded.
--
Gustavo
^ permalink raw reply [flat|nested] 3+ messages in thread
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2018-01-10 23:15 [PATCH v2] drm/amdkfd: Fix potential NULL pointer dereferences Gustavo A. R. Silva
2018-01-11 14:40 ` Oded Gabbay
2018-01-11 17:42 ` Gustavo A. R. Silva
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