linux-kernel - [PATCH] stacktrace: don't crash on invalid stack trace structs

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Date:	Sun, 04 May 2008 14:39:21 +0200
From:	Johannes Berg <johannes@...solutions.net>
To:	Ingo Molnar <mingo@...hat.com>
Cc:	Linux Kernel list <linux-kernel@...r.kernel.org>
Subject: [PATCH] stacktrace: don't crash on invalid stack trace structs

This patch makes the stacktrace printout code warn when the entries
pointer is unset rather than crashing when trying to access it in an
attempt to make it a bit more robust.

Signed-off-by: Johannes Berg <johannes@...solutions.net>
---
I was saving a stacktrace into an skb and forgot to copy it across skb
copies... Not sure if you want this, I have since fixed the code, but it
would have been easier had the kernel not crashed in an interrupt.

--- everything.orig/kernel/stacktrace.c	2008-05-04 14:02:14.000000000 +0200
+++ everything/kernel/stacktrace.c	2008-05-04 14:02:24.000000000 +0200
@@ -13,6 +13,9 @@ void print_stack_trace(struct stack_trac
 {
 	int i, j;
 
+	if (WARN_ON(!trace->entries))
+		return;
+
 	for (i = 0; i < trace->nr_entries; i++) {
 		unsigned long ip = trace->entries[i];
 


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