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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 <>
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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