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s390/unwind: report an error if pt_regs are not on stack 

If unwinder is looking at pt_regs which is not on stack then something
went wrong and an error has to be reported rather than successful
unwinding termination.

Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Vasily Gorbik 2019-11-22 15:53:30 +01:00
parent 7bcaad1f9f
commit 67f5593419
1 changed files with 1 additions and 1 deletions
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2
arch/s390/kernel/unwind_bc.c
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@ -76,7 +76,7 @@ bool unwind_next_frame(struct unwind_state *state)
/* No back-chain, look for a pt_regs structure */
sp = state->sp + STACK_FRAME_OVERHEAD;
if (!on_stack(info, sp, sizeof(struct pt_regs)))
goto out_stop;
goto out_err;
regs = (struct pt_regs *) sp;
if (READ_ONCE_NOCHECK(regs->psw.mask) & PSW_MASK_PSTATE)
goto out_stop;