[PATCH] Fix infinite loop in ARM user perf_event backtrace code

Jamie Iles jamie at jamieiles.com
Mon Apr 18 06:42:26 EDT 2011


On Fri, Apr 15, 2011 at 08:27:25PM -0700, Sonny Rao wrote:
> The ARM user backtrace code can get into an infinite loop if it
> runs into an invalid stack frame which points back to itself.
> This situation has been observed in practice.  Fix it by capping
> the number of entries in the backtrace.  This is also what other
> architectures do in their backtrace code.

Tested on my v6k board and looks good.

> Signed-off-by: Sonny Rao <sonnyrao at chromium.org>

Acked-by: Jamie Iles <jamie at jamieiles.com>


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