Patch "perf: Do not double free" has been added to the 4.4-stable tree

This is a note to let you know that I've just added the patch titled

perf: Do not double free

to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
perf-do-not-double-free.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Peter Zijlstra <[email protected]>
Date: Wed, 24 Feb 2016 18:45:41 +0100
Subject: perf: Do not double free

From: Peter Zijlstra <[email protected]>

commit 130056275ade730e7a79c110212c8815202773ee upstream.

In case of: err_file: fput(event_file), we'll end up calling perf_release() which in turn will free the event.

Do not then free the event _again_.

---
 kernel/events/core.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

@@ -8583,7 +8583,12 @@ err_context:
 	perf_unpin_context(ctx);
 	put_ctx(ctx);
 err_alloc:
-	free_event(event);
+	/*
+	 * If event_file is set, the fput() above will have called ->release()
+	 * and that will take care of freeing the event.
+	 */
+	if (!event_file)
+		free_event(event);
 err_cpus:
 	put_online_cpus();
 err_task:

Patches currently in stable-queue which might be from [email protected] are

queue-4.4/perf-cure-event-pending_disable-race.patch queue-4.4/perf-do-not-double-free.patch