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Revert "drm/amdgpu: fix slab-use-after-free in amdgpu_userq_mgr_fini"

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This reverts commit 5fb90421fa.

The original patch moved `amdgpu_userq_mgr_fini()` to the driver's
`postclose` callback, which is called after `drm_gem_release()` in
the DRM file cleanup sequence.If a user application crashes or aborts
without cleaning up its user queues, 'drm_gem_release()` may free
GEM objects that are still referenced by active user queues, leading
to use-after-free. By reverting, we ensure that user queues are
disabled and cleaned up before any GEM objects are released,
preventing this class of bug. However, this reintroduces a race
during PCI hot-unplug, where device removal can race with per-file
cleanup, leading to use-after-free in suspend/unplug paths.
This will be fixed in the next patch.

Fixes: 5fb90421fa ("drm/amdgpu: fix slab-use-after-free in amdgpu_userq_mgr_fini+0x70c")
Signed-off-by: Vitaly Prosyak <vitaly.prosyak@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Vitaly Prosyak
2025-06-24 12:05:10 -04:00
committed by Alex Deucher
parent df2719088b
commit a73345b866
2 changed files with 15 additions and 4 deletions
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16
drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
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@@ -2911,6 +2911,20 @@ done:
return ret;
}
static int amdgpu_drm_release(struct inode *inode, struct file *filp)
{
struct drm_file *file_priv = filp->private_data;
struct amdgpu_fpriv *fpriv = file_priv->driver_priv;
if (fpriv) {
fpriv->evf_mgr.fd_closing = true;
amdgpu_eviction_fence_destroy(&fpriv->evf_mgr);
amdgpu_userq_mgr_fini(&fpriv->userq_mgr);
}
return drm_release(inode, filp);
}
long amdgpu_drm_ioctl(struct file *filp,
unsigned int cmd, unsigned long arg)
{
@@ -2962,7 +2976,7 @@ static const struct file_operations amdgpu_driver_kms_fops = {
.owner = THIS_MODULE,
.open = drm_open,
.flush = amdgpu_flush,
.release = drm_release,
.release = amdgpu_drm_release,
.unlocked_ioctl = amdgpu_drm_ioctl,
.mmap = drm_gem_mmap,
.poll = drm_poll,