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drm/amdkfd: fix kernel crash on releasing NULL sysfs entry

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there is an abnormal case that When a process re-opens kfd
with different mm_struct(execve() called by user), the
allocated p->kobj will be freed, but missed setting it to NULL,
that will cause sysfs/kernel crash with NULL pointers in p->kobj
on kfd_process_remove_sysfs() when releasing process, and the
similar error on kfd_procfs_del_queue() as well.

Signed-off-by: Eric Huang <jinhuieric.huang@amd.com>
Reviewed-by: Kent Russell <kent.russell@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Eric Huang 2026-03-27 09:46:42 -04:00 committed by Alex Deucher
parent 964e532d58
commit 4ea64d482f
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/amd/amdkfd/kfd_process.c
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@ -679,7 +679,7 @@ static void kfd_procfs_add_sysfs_files(struct kfd_process *p)
void kfd_procfs_del_queue(struct queue *q)
{
if (!q)
if (!q || !q->process->kobj)
return;
kobject_del(&q->kobj);
@ -858,6 +858,7 @@ int kfd_create_process_sysfs(struct kfd_process *process)
if (ret) {
pr_warn("Creating procfs pid directory failed");
kobject_put(process->kobj);
process->kobj = NULL;
return ret;
}