KVM: s390/diag: fix racy access of physical cpu number in diag 9c handler

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[ Upstream commit 0bc380beb7 ]

We do check for target CPU == -1, but this might change at the time we
are going to use it. Hold the physical target CPU in a local variable to
avoid out-of-bound accesses to the cpu arrays.

Cc: Pierre Morel <pmorel@linux.ibm.com>
Fixes: 87e28a15c4 ("KVM: s390: diag9c (directed yield) forwarding")
Reported-by: Marc Hartmayer <mhartmay@linux.ibm.com>
Reviewed-by: Nico Boehr <nrb@linux.ibm.com>
Reviewed-by: Pierre Morel <pmorel@linux.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@linux.ibm.com>
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

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Christian Borntraeger 2023-05-15 10:42:34 +02:00 • committed by Greg Kroah-Hartman

parent c78ad1060c

commit 86bfb18bad

1 changed files with 5 additions and 3 deletions

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arch/s390/kvm/diag.c

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