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drm/nouveau/svm: Fix refcount leak bug and missing check against null bug

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The reference counting issue happens in one exception handling path of
nouveau_svmm_bind(). When cli->svm.svmm is null, the function forgets
to decrease the refcount of mm increased by get_task_mm(), causing a
refcount leak.

Fix this issue by using mmput() to decrease the refcount in the
exception handling path.

Also, the function forgets to do check against null when get mm
by get_task_mm().

Fix this issue by adding null check after get mm by get_task_mm().

Signed-off-by: Chenyuan Mi <cymi20@fudan.edu.cn>
Signed-off-by: Xiyu Yang <xiyuyang19@fudan.edu.cn>
Signed-off-by: Xin Tan <tanxin.ctf@gmail.com>
Fixes: 822cab6150 ("drm/nouveau/svm: check for SVM initialized before migrating")
Reviewed-by: Lyude Paul <lyude@redhat.com>
Reviewed-by: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Karol Herbst <kherbst@redhat.com>
Signed-off-by: Karol Herbst <kherbst@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210907122633.16665-1-cymi20@fudan.edu.cn
Link: https://gitlab.freedesktop.org/drm/nouveau/-/merge_requests/14
This commit is contained in:
Chenyuan Mi 2021-09-07 20:26:33 +08:00 committed by Karol Herbst
parent 93f43ed81a
commit 6bb8c2d518
1 changed files with 4 additions and 0 deletions
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4
drivers/gpu/drm/nouveau/nouveau_svm.c
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@ -162,10 +162,14 @@ nouveau_svmm_bind(struct drm_device *dev, void *data,
*/
mm = get_task_mm(current);
if (!mm) {
return -EINVAL;
}
mmap_read_lock(mm);
if (!cli->svm.svmm) {
mmap_read_unlock(mm);
mmput(mm);
return -EINVAL;
}