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drm/amdkfd: Fix NULL pointer check order in kfd_ioctl_create_process 

In kfd_ioctl_create_process(), the pointer 'p' is used before checking
if it is NULL.

The code accesses p->context_id before validating 'p'. This can lead
to a possible NULL pointer dereference.

Move the NULL check before using 'p' so that the pointer is validated
before access.

Fixes the below:
drivers/gpu/drm/amd/amdgpu/../amdkfd/kfd_chardev.c:3177 kfd_ioctl_create_process() warn: variable dereferenced before check 'p' (see line 3174)

Fixes: cc6b66d661 ("amdkfd: introduce new ioctl AMDKFD_IOC_CREATE_PROCESS")
Cc: Zhu Lingshan <lingshan.zhu@amd.com>
Cc: Felix Kuehling <felix.kuehling@amd.com>
Cc: Christian König <christian.koenig@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: Dan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: Srinivasan Shanmugam <srinivasan.shanmugam@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 19d4149b22f57094bfc4b86b742381b3ca394ead)
This commit is contained in:
Srinivasan Shanmugam 2026-03-23 14:28:57 +05:30 committed by Alex Deucher
parent 9da4f9964a
commit 429aec2bc0
1 changed files with 3 additions and 3 deletions
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6
drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
View File

@ -3170,11 +3170,11 @@ static int kfd_ioctl_create_process(struct file *filep, struct kfd_process *p, v
struct kfd_process *process;
int ret;
/* Each FD owns only one kfd_process */
if (p->context_id != KFD_CONTEXT_ID_PRIMARY)
if (!filep->private_data || !p)
return -EINVAL;
if (!filep->private_data || !p)
/* Each FD owns only one kfd_process */
if (p->context_id != KFD_CONTEXT_ID_PRIMARY)
return -EINVAL;
mutex_lock(&kfd_processes_mutex);