From: Markus Elfring <Markus.Elfring@web.de>
Date: Thu, 13 Apr 2023 14:46:39 +0200
Subject: [PATCH] perf map: Delete two variable initialisations before null
 pointer checks in sort__sym_from_cmp()
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
References: bsc#1012628
Patch-mainline: 6.3.3
Git-commit: c160118a90d4acf335993d8d59b02ae2147a524e

[ Upstream commit c160118a90d4acf335993d8d59b02ae2147a524e ]

Addresses of two data structure members were determined before
corresponding null pointer checks in the implementation of the function
“sort__sym_from_cmp”.

Thus avoid the risk for undefined behaviour by removing extra
initialisations for the local variables “from_l” and “from_r” (also
because they were already reassigned with the same value behind this
pointer check).

This issue was detected by using the Coccinelle software.

Fixes: 1b9e97a2a95e4941 ("perf tools: Fix report -F symbol_from for data without branch info")
Signed-off-by: <elfring@users.sourceforge.net>
Acked-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: German Gomez <german.gomez@arm.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/cocci/54a21fea-64e3-de67-82ef-d61b90ffad05@web.de/
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
 tools/perf/util/sort.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/tools/perf/util/sort.c b/tools/perf/util/sort.c
index 4d6a51b1..27701058 100644
--- a/tools/perf/util/sort.c
+++ b/tools/perf/util/sort.c
@@ -974,8 +974,7 @@ static int hist_entry__dso_to_filter(struct hist_entry *he, int type,
 static int64_t
 sort__sym_from_cmp(struct hist_entry *left, struct hist_entry *right)
 {
-	struct addr_map_symbol *from_l = &left->branch_info->from;
-	struct addr_map_symbol *from_r = &right->branch_info->from;
+	struct addr_map_symbol *from_l, *from_r;
 
 	if (!left->branch_info || !right->branch_info)
 		return cmp_null(left->branch_info, right->branch_info);
-- 
2.35.3