Commit 67f55934 authored Nov 22, 2019 by Vasily Gorbik

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>

parent 7bcaad1f

arch/s390/kernel/unwind_bc.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -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;