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perf/core: Fix reversed NULL check in perf_event_groups_less() 

This NULL check is reversed so it leads to a Smatch warning and
presumably a NULL dereference.

    kernel/events/core.c:1598 perf_event_groups_less()
    error: we previously assumed 'right->cgrp->css.cgroup' could be null
	(see line 1590)

Fixes: 95ed6c707f ("perf/cgroup: Order events in RB tree by cgroup id")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20200312105637.GA8960@mwanda
This commit is contained in:
Dan Carpenter 2020-03-12 13:56:37 +03:00 committed by Peter Zijlstra
parent 90c91dfb86
commit a6763625ae
1 changed files with 1 additions and 1 deletions
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kernel/events/core.c
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@ -1586,7 +1586,7 @@ perf_event_groups_less(struct perf_event *left, struct perf_event *right)
*/
return true;
}
if (!right->cgrp || right->cgrp->css.cgroup) {
if (!right->cgrp || !right->cgrp->css.cgroup) {
/*
* Right has no cgroup but left does, no cgroups come
* first.