https://github.com/torvalds/linux
Revision 0cbb4b4f4c44f54af268969b18d8deda63aded59 authored by Andrea Arcangeli on 05 January 2018, 00:18:09 UTC, committed by Linus Torvalds on 05 January 2018, 00:45:09 UTC
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>
1 parent d09cfbb
History
Tip revision: 0cbb4b4f4c44f54af268969b18d8deda63aded59 authored by Andrea Arcangeli on 05 January 2018, 00:18:09 UTC
userfaultfd: clear the vma->vm_userfaultfd_ctx if UFFD_EVENT_FORK fails
Tip revision: 0cbb4b4
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