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| author | Andrea Arcangeli <aarcange@redhat.com> | 2018-01-05 03:18:09 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-01-05 03:45:09 +0300 |
| commit | 0cbb4b4f4c44f54af268969b18d8deda63aded59 (patch) | |
| tree | e4195e9d5425397f557117077d6306eadf94e350 /README | |
| parent | d09cfbbfa0f761a97687828b5afb27b56cbf2e19 (diff) | |
| download | linux-0cbb4b4f4c44f54af268969b18d8deda63aded59.tar.xz | |
userfaultfd: clear the vma->vm_userfaultfd_ctx if UFFD_EVENT_FORK fails
The previous fix in commit 384632e67e08 ("userfaultfd: non-cooperative:
fix fork use after free") corrected the refcounting in case of
UFFD_EVENT_FORK failure for the fork userfault paths.
That still didn't clear the vma->vm_userfaultfd_ctx of the vmas that
were set to point to the aborted new uffd ctx earlier in
dup_userfaultfd.
Link: http://lkml.kernel.org/r/20171223002505.593-2-aarcange@redhat.com
Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Reported-by: syzbot <syzkaller@googlegroups.com>
Reviewed-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Cc: Eric Biggers <ebiggers3@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'README')
0 files changed, 0 insertions, 0 deletions