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.

I was saving a stacktrace into an skb and forgot to copy it across skb
copies... I have since fixed the code, but it would have been easier
had the kernel not crashed in an interrupt.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Johannes Berg 2008-05-12 21:21:14 +02:00 committed by Thomas Gleixner
parent 75d3bce2fc
commit bfeeeeb991

View file

@ -13,6 +13,9 @@ void print_stack_trace(struct stack_trace *trace, int spaces)
{
int i, j;
if (WARN_ON(!trace->entries))
return;
for (i = 0; i < trace->nr_entries; i++) {
unsigned long ip = trace->entries[i];