[PATCH] i386: Terminate backtrace fallback early if unwinder stack pointer is zero

Cc: jbeulich@novell.com
Signed-off-by: Andi Kleen <ak@suse.de>

1 files changed, 2 insertions, 0 deletions

diff --git a/arch/i386/kernel/traps.c b/arch/i386/kernel/traps.c
index 4ced4285163b..86fa7e47f301 100644
--- a/arch/i386/kernel/traps.c
+++ b/arch/i386/kernel/traps.c
@@ -197,6 +197,8 @@ void dump_trace(struct task_struct *task, struct pt_regs *regs,
                                 if (UNW_SP(&info) >= PAGE_OFFSET) {
                                         ops->warning(data, "Leftover inexact backtrace:\n");
                                         stack = (void *)UNW_SP(&info);
+                                        if (!stack)
+                                                return;
                                 } else
                                         ops->warning(data, "Full inexact backtrace again:\n");
                         } else if (call_trace >= 1)