This is a note to let you know that I've just added the patch titled

powerpc/perf/hv-24x7: Fix incorrect comparison in memord

to the 4.14-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: powerpc-perf-hv-24x7-fix-incorrect-comparison-in-memord.patch and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From foo@baz Mon Dec 18 13:28:59 CET 2017

From: Michael Ellerman mpe@ellerman.id.au Date: Mon, 9 Oct 2017 21:52:44 +1100 Subject: powerpc/perf/hv-24x7: Fix incorrect comparison in memord

From: Michael Ellerman mpe@ellerman.id.au

[ Upstream commit 05c14c03138532a3cb2aa29c2960445c8753343b ]

In the hv-24x7 code there is a function memord() which tries to implement a sort function return -1, 0, 1. However one of the conditions is incorrect, such that it can never be true, because we will have already returned.

I don't believe there is a bug in practice though, because the comparisons are an optimisation prior to calling memcmp().

Fix it by swapping the second comparision, so it can be true.

Reported-by: David Binderman dcb314@hotmail.com Signed-off-by: Michael Ellerman mpe@ellerman.id.au Signed-off-by: Sasha Levin alexander.levin@verizon.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/powerpc/perf/hv-24x7.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/powerpc/perf/hv-24x7.c +++ b/arch/powerpc/perf/hv-24x7.c @@ -540,7 +540,7 @@ static int memord(const void *d1, size_t { if (s1 < s2) return 1; - if (s2 > s1) + if (s1 > s2) return -1;

return memcmp(d1, d2, s1);

Patches currently in stable-queue which might be from mpe@ellerman.id.au are

queue-4.14/powerpc-xmon-check-before-calling-xive-functions.patch queue-4.14/powerpc-perf-hv-24x7-fix-incorrect-comparison-in-memord.patch queue-4.14/powerpc-powernv-cpufreq-fix-the-frequency-read-by-proc-cpuinfo.patch queue-4.14/powerpc-pseries-vio-dispose-of-virq-mapping-on-vdevice-unregister.patch queue-4.14/powerpc-ipic-fix-status-get-and-status-clear.patch queue-4.14/powerpc-opal-fix-ebusy-bug-in-acquiring-tokens.patch