s390/unwind: filter out unreliable bogus %r14

[linux-2.6-microblaze.git] / arch / s390 / kernel / unwind_bc.c

diff --git a/arch/s390/kernel/unwind_bc.c b/arch/s390/kernel/unwind_bc.c
index e1371cd..ef42d5f 100644 (file)
--- a/arch/s390/kernel/unwind_bc.c
+++ b/arch/s390/kernel/unwind_bc.c
@@ -57,6 +57,11 @@ bool unwind_next_frame(struct unwind_state *state)
                ip = READ_ONCE_NOCHECK(sf->gprs[8]);
                reliable = false;
                regs = NULL;
+               if (!__kernel_text_address(ip)) {
+                       /* skip bogus %r14 */
+                       state->regs = NULL;
+                       return unwind_next_frame(state);
+               }
        } else {
                sf = (struct stack_frame *) state->sp;
                sp = READ_ONCE_NOCHECK(sf->back_chain);