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

Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's

*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***

The -mm tree is included into linux-next via the mm-everything branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm and is updated there every 2-3 working days

------------------------------------------------------ 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