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

From: David Hildenbrand
Date: Mon Jan 02 2023 - 07:02:16 EST


On 28.12.22 20:42, Suren Baghdasaryan wrote:
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);

Wouldn't it be me more consistent to check for "vma->anon_name"?

That's what dup_anon_vma_name() checks. And it's safe now because anon_name is no longer overloaded in vm_area_struct.

--
Thanks,

David / dhildenb