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| author | Rob Clark <robdclark@chromium.org> | 2022-11-30 10:57:47 -0800 |
|---|---|---|
| committer | Javier Martinez Canillas <javierm@redhat.com> | 2022-12-04 18:56:52 +0100 |
| commit | 24013314be6ee4ee456114a671e9fa3461323de8 (patch) | |
| tree | 1f97a7f8c3724b0c76202bcdb2569205f8ace9a2 /drivers/gpu/drm/drm_gem_shmem_helper.c | |
| parent | d3d6b1bf85aefe0ebc0624574b3bb62f0693914c (diff) | |
| download | linux-24013314be6ee4ee456114a671e9fa3461323de8.tar.gz linux-24013314be6ee4ee456114a671e9fa3461323de8.tar.bz2 linux-24013314be6ee4ee456114a671e9fa3461323de8.zip | |
drm/shmem-helper: Remove errant put in error path
drm_gem_shmem_mmap() doesn't own this reference, resulting in the GEM
object getting prematurely freed leading to a later use-after-free.
Link: https://syzkaller.appspot.com/bug?extid=c8ae65286134dd1b800d
Reported-by: syzbot+c8ae65286134dd1b800d@syzkaller.appspotmail.com
Fixes: 2194a63a818d ("drm: Add library for shmem backed GEM objects")
Cc: stable@vger.kernel.org
Signed-off-by: Rob Clark <robdclark@chromium.org>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221130185748.357410-2-robdclark@gmail.com
Diffstat (limited to 'drivers/gpu/drm/drm_gem_shmem_helper.c')
| -rw-r--r-- | drivers/gpu/drm/drm_gem_shmem_helper.c | 4 |
1 files changed, 1 insertions, 3 deletions
diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c index 35138f8a375c..3b7b71391a4c 100644 --- a/drivers/gpu/drm/drm_gem_shmem_helper.c +++ b/drivers/gpu/drm/drm_gem_shmem_helper.c @@ -622,10 +622,8 @@ int drm_gem_shmem_mmap(struct drm_gem_shmem_object *shmem, struct vm_area_struct } ret = drm_gem_shmem_get_pages(shmem); - if (ret) { - drm_gem_vm_close(vma); + if (ret) return ret; - } vma->vm_flags |= VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP; vma->vm_page_prot = vm_get_page_prot(vma->vm_flags); |