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
