From 3ad1be6faef9a482c3098928220fcafaa51a1283 Mon Sep 17 00:00:00 2001
From: Arnaldo Carvalho de Melo <acme@redhat.com>
Date: Tue, 18 Apr 2023 12:46:02 -0300
Subject: perf dso: Fix use before NULL check introduced by map__dso()
 introduction

James Clark noticed that the recent 63df0e4bc368adbd ("perf map: Add
accessor for dso") patch accessed map->dso before the 'map' variable was
NULL checked, which is a change in logic that leads to segmentation
faults, so comb thru that patch to fix similar cases.

Fixes: 63df0e4bc368adbd ("perf map: Add accessor for dso")
Acked-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@arm.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: John Garry <john.g.garry@oracle.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org
Cc: Suzuki Poulouse <suzuki.poulose@arm.com>
Cc: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/lkml/ZD68RYCVT8hqPuxr@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/builtin-script.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

(limited to 'tools/perf/builtin-script.c')

diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
index 8fba247b798c..006f522d0e7f 100644
--- a/tools/perf/builtin-script.c
+++ b/tools/perf/builtin-script.c
@@ -1075,8 +1075,7 @@ static int grab_bb(u8 *buffer, u64 start, u64 end,
 		return 0;
 	}
 
-	dso = map__dso(al.map);
-	if (!thread__find_map(thread, *cpumode, start, &al) || !dso) {
+	if (!thread__find_map(thread, *cpumode, start, &al) || (dso = map__dso(al.map)) == NULL) {
 		pr_debug("\tcannot resolve %" PRIx64 "-%" PRIx64 "\n", start, end);
 		return 0;
 	}
@@ -1106,9 +1105,9 @@ static int map__fprintf_srccode(struct map *map, u64 addr, FILE *fp, struct srcc
 	unsigned line;
 	int len;
 	char *srccode;
-	struct dso *dso = map__dso(map);
+	struct dso *dso;
 
-	if (!map || !dso)
+	if (!map || (dso = map__dso(map)) == NULL)
 		return 0;
 	srcfile = get_srcline_split(dso,
 				    map__rip_2objdump(map, addr),
-- 
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