The patch titled Subject: mm: fix vma->anon_name memory leak for anonymous shmem VMAs has been added to the -mm mm-hotfixes-unstable branch. Its filename is mm-fix-vma-anon_name-memory-leak-for-anonymous-shmem-vmas.patch
This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches...
This patch will later appear in the mm-hotfixes-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------ From: Suren Baghdasaryan surenb@google.com Subject: mm: fix vma->anon_name memory leak for anonymous shmem VMAs Date: Wed, 4 Jan 2023 16:02:40 -0800
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 calling anon_vma_name_put() unconditionally. It will free vma->anon_name whenever it's non-NULL.
Link: https://lkml.kernel.org/r/20230105000241.1450843-1-surenb@google.com Fixes: d09e8ca6cb93 ("mm: anonymous shared memory naming") Signed-off-by: Suren Baghdasaryan surenb@google.com Suggested-by: David Hildenbrand david@redhat.com Reported-by: syzbot+91edf9178386a07d06a7@syzkaller.appspotmail.com Cc: David Hildenbrand david@redhat.com Cc: Hugh Dickins hughd@google.com Cc: Pasha Tatashin pasha.tatashin@soleen.com Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org ---
include/linux/mm_inline.h | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-)
--- a/include/linux/mm_inline.h~mm-fix-vma-anon_name-memory-leak-for-anonymous-shmem-vmas +++ a/include/linux/mm_inline.h @@ -413,8 +413,7 @@ static inline void free_anon_vma_name(st * 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) - anon_vma_name_put(vma->anon_name); + anon_vma_name_put(vma->anon_name); }
static inline bool anon_vma_name_eq(struct anon_vma_name *anon_name1, _
Patches currently in -mm which might be from surenb@google.com are
mm-fix-vma-anon_name-memory-leak-for-anonymous-shmem-vmas.patch