From: Frederic Weisbecker <fweisbec@gmail.com>
Date: Wed, 22 Oct 2008 17:14:55 +0000 (+0200)
Subject: tracepoint: check if the probe has been registered
X-Git-Tag: v2.6.28-rc3~86^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f66af459a931f25807e1df7915b2b66bb5978d82;p=pandora-kernel.git

tracepoint: check if the probe has been registered

Impact: fix kernel crash that can trigger during tracing

If we try to remove a probe that has not been already registered,
the tracepoint_entry_remove_probe() function will dereference a NULL
pointer.

Check the probe before removing it to avoid crashes.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Acked-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Acked-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

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