[PATCH 1/1] mm: fix vma->anon_name memory leak for anonymous shmem VMAs

[Suren Baghdasaryan]

free_anon_vma_name() is missing a check for anonymous shmem VMA which
leads to a memory leak due to refcount not being dropped. Fix this by
adding the missing check.

Fixes: d09e8ca6cb93 ("mm: anonymous shared memory naming")
Reported-by: syzbot+91edf9178386a07d06a7@xxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Suren Baghdasaryan <surenb@xxxxxxxxxx>
---
 include/linux/mm_inline.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/mm_inline.h b/include/linux/mm_inline.h
index e8ed225d8f7c..d650ca2c5d29 100644
--- a/include/linux/mm_inline.h
+++ b/include/linux/mm_inline.h
@@ -413,7 +413,7 @@ static inline void free_anon_vma_name(struct vm_area_struct *vma)
 	 * Not using anon_vma_name because it generates a warning if mmap_lock
 	 * is not held, which might be the case here.
 	 */
-	if (!vma->vm_file)
+	if (!vma->vm_file || vma_is_anon_shmem(vma))
 		anon_vma_name_put(vma->anon_name);
 }
 
-- 
2.39.0.314.g84b9a713c41-goog