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authorWang Nan <wangnan0@huawei.com>2015-11-05 13:19:25 (GMT)
committerArnaldo Carvalho de Melo <acme@redhat.com>2015-11-05 15:47:52 (GMT)
commit98d3b258ede2cdac31a2728543f652964e597e79 (patch)
tree66000c66d8c031df7cc42c5357f79cb402edbf34
parent956959f6b7a982b2e789a7a8fa1de437074a5eb9 (diff)
downloadlinux-98d3b258ede2cdac31a2728543f652964e597e79.tar.xz
perf tools: Fix find_perf_probe_point_from_map() which incorrectly returns success
It is possible that find_perf_probe_point_from_map() fails to find a symbol but still returns 0 because of an small error when coding: find_perf_probe_point_from_map() set 'ret' to error code at first, but also use it to hold return value of kernel_get_symbol_address_by_name(). This patch resets 'ret' to error even kernel_get_symbol_address_by_name() success, so if !sym, the whole function returns error correctly. Signed-off-by: Wang Nan <wangnan0@huawei.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Zefan Li <lizefan@huawei.com> Cc: pi3orama@163.com Link: http://lkml.kernel.org/r/1446729565-27592-3-git-send-email-wangnan0@huawei.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
-rw-r--r--tools/perf/util/probe-event.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index b51a8bf..e659c4f 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -1905,6 +1905,9 @@ static int find_perf_probe_point_from_map(struct probe_trace_point *tp,
sym = __find_kernel_function(addr, &map);
}
}
+
+ /* ret may has be overwritten so reset it */
+ ret = -ENOENT;
if (!sym)
goto out;