From 950fee84557416a3427dd404a13addc4be7b3e6c Mon Sep 17 00:00:00 2001
From: Andi Kleen <ak@suse.de>
Date: Tue, 26 Sep 2006 10:52:34 +0200
Subject: [PATCH] [PATCH] i386: Terminate backtrace fallback early if unwinder
 stack pointer is zero

Cc: jbeulich@novell.com
Signed-off-by: Andi Kleen <ak@suse.de>
---
 arch/i386/kernel/traps.c | 2 ++
 1 file changed, 2 insertions(+)

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)
-- 
GitLab