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perf/core: Fix potential NULL deref 

commit a71ef31485 upstream.

Smatch is awesome.

Fixes: 32671e3799 ("perf: Disallow mis-matched inherited group reads")
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Peter Zijlstra 2023-10-24 11:42:21 +02:00 committed by Greg Kroah-Hartman
parent 5e232f2205
commit 8b8cde8ebb
1 changed files with 2 additions and 1 deletions
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3
kernel/events/core.c
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@ -13293,7 +13293,8 @@ static int inherit_group(struct perf_event *parent_event,
!perf_get_aux_event(child_ctr, leader)) !perf_get_aux_event(child_ctr, leader))
return -EINVAL; return -EINVAL;
} }
leader->group_generation = parent_event->group_generation; if (leader)
leader->group_generation = parent_event->group_generation;
return 0; return 0;
} }