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perf bpf: Return NULL when RB tree lookup fails in perf_env__find_btf()

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We don't return NULL when we don't find the bpf_prog_info_node, fix
that.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Reported-by: Song Liu <songliubraving@fb.com>
Acked-by: Song Liu <songliubraving@fb.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Fixes: 3792cb2ff43b ("perf bpf: Save BTF in a rbtree in perf_env")
Link: http://lkml.kernel.org/r/20190417145539.11669-1-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jiri Olsa 2019-04-17 16:55:39 +02:00 committed by Arnaldo Carvalho de Melo
parent b9abbdfa88
commit 2db7b1e0bd
1 changed files with 3 additions and 1 deletions
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4
tools/perf/util/env.c
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@ -111,10 +111,12 @@ struct btf_node *perf_env__find_btf(struct perf_env *env, __u32 btf_id)
else if (btf_id > node->id)
n = n->rb_right;
else
break;
goto out;
}
node = NULL;
up_read(&env->bpf_progs.lock);
out:
return node;
}