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* [PATCH] trace-cmd: Test for NULL pointer in tracecmd_tsync_free()
@ 2021-03-24 22:00 Steven Rostedt
  0 siblings, 0 replies; only message in thread
From: Steven Rostedt @ 2021-03-24 22:00 UTC (permalink / raw)
  To: Linux Trace Devel

From: "Steven Rostedt (VMware)" <>

If an error happens it is possible that tracecmd_tsync_free() gets called
with a NULL pointer, which causes a SIGSEGV crash. Prevent a crash by
testing if the tsync passed into tracecmd_tsync_free() is NULL.

Signed-off-by: Steven Rostedt (VMware) <>
 lib/trace-cmd/trace-timesync.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/trace-cmd/trace-timesync.c b/lib/trace-cmd/trace-timesync.c
index 8d01c0bc..a4083f51 100644
--- a/lib/trace-cmd/trace-timesync.c
+++ b/lib/trace-cmd/trace-timesync.c
@@ -381,7 +381,7 @@ void tracecmd_tsync_free(struct tracecmd_time_sync *tsync)
 	struct clock_sync_context *tsync_context;
 	struct tsync_proto *proto;
-	if (!tsync->context)
+	if (!tsync || !tsync->context)
 	tsync_context = (struct clock_sync_context *)tsync->context;

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2021-03-24 22:00 [PATCH] trace-cmd: Test for NULL pointer in tracecmd_tsync_free() Steven Rostedt

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