s390/unwind: avoid int overflow in outside_of_stack

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When current task is interrupted in-between stack frame allocation
and backchain write instructions new stack frame backchain pointer
is left uninitialized. That invalid backchain value is passed into
outside_of_stack for sanity check. Make sure int overflow does not happen
by subtracting stack_frame size from the stack "end" rather than adding
it to "random" backchain value.

Fixes: 41b0474c1b1c ("s390/unwind: introduce stack unwind API")
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

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Vasily Gorbik 2019-07-08 14:24:38 +02:00

parent 73df167c81

commit 9a15919041

1 changed files with 1 additions and 1 deletions

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arch/s390/kernel/unwind_bc.c

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