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    SubjectRe: [PATCH v2] relay: handle alloc_percpu returning NULL in relay_open
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    [ + akpm ]

    Daniel Axtens <dja@axtens.net> writes:
    >>> > Check if alloc_percpu returns NULL.
    >>> >
    >>> > This was found by syzkaller both on x86 and powerpc, and the reproducer
    >>> > it found on powerpc is capable of hitting the issue as an unprivileged
    >>> > user.
    >>> >
    >>> > Fixes: 017c59c042d0 ("relay: Use per CPU constructs for the relay channel buffer pointers")
    >>> > Reported-by: syzbot+1e925b4b836afe85a1c6@syzkaller-ppc64.appspotmail.com
    >>> > Reported-by: syzbot+587b2421926808309d21@syzkaller-ppc64.appspotmail.com
    >>> > Reported-by: syzbot+58320b7171734bf79d26@syzkaller.appspotmail.com
    >>> > Reported-by: syzbot+d6074fb08bdb2e010520@syzkaller.appspotmail.com
    >>> > Cc: Akash Goel <akash.goel@intel.com>
    >>> > Cc: Andrew Donnellan <ajd@linux.ibm.com> # syzkaller-ppc64
    >>> > Reviewed-by: Michael Ellerman <mpe@ellerman.id.au>
    >>> > Reviewed-by: Andrew Donnellan <ajd@linux.ibm.com>
    >>> > Cc: stable@vger.kernel.org # v4.10+
    >>> > Signed-off-by: Daniel Axtens <dja@axtens.net>
    >>>
    >>> Acked-by: David Rientjes <rientjes@google.com>
    >>
    >> It looks this one was never applied (which relates to CVE-2019-19462,
    >> as pointed by Guenter in 20191223163610.GA32267@roeck-us.net).
    >>
    >> Whas this lost or are there any issues pending?
    >
    > I'm not aware of any pending issues.
    >
    > (But, if anyone does have any objections I'm happy to revise the patch.)

    It looks like kernel/relay.c is lacking a maintainer?

    Andrew are you able to pick this up for v5.8? It's pretty obviously
    correct, and has David's ack.

    Original is here if that helps:
    https://lore.kernel.org/lkml/20191219121256.26480-1-dja@axtens.net/


    cheers

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