Patch "perf/core: Fix potential NULL deref" has been added to the 4.19-stable tree

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

    perf/core: Fix potential NULL deref

to the 4.19-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-core-fix-potential-null-deref.patch
and it can be found in the queue-4.19 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From a71ef31485bb51b846e8db8b3a35e432cc15afb5 Mon Sep 17 00:00:00 2001
From: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Date: Tue, 24 Oct 2023 11:42:21 +0200
Subject: perf/core: Fix potential NULL deref

From: Peter Zijlstra <peterz@xxxxxxxxxxxxx>

commit a71ef31485bb51b846e8db8b3a35e432cc15afb5 upstream.

Smatch is awesome.

Fixes: 32671e3799ca ("perf: Disallow mis-matched inherited group reads")
Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 kernel/events/core.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -11629,7 +11629,8 @@ static int inherit_group(struct perf_eve
 		if (IS_ERR(child_ctr))
 			return PTR_ERR(child_ctr);
 	}
-	leader->group_generation = parent_event->group_generation;
+	if (leader)
+		leader->group_generation = parent_event->group_generation;
 	return 0;
 }
 


Patches currently in stable-queue which might be from peterz@xxxxxxxxxxxxx are

queue-4.19/perf-core-fix-potential-null-deref.patch



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