From: Leo Yan <[email protected]>
[ Upstream commit 363bbaef63ffebcc745239fe80a953ebb5ac9ec9 ]
Based on the following report from Smatch, fix the potential NULL
pointer dereference check.
tools/perf/util/map.c:479
map__fprintf_srccode() error: we previously assumed 'state' could be
null (see line 466)
tools/perf/util/map.c
465 /* Avoid redundant printing */
466 if (state &&
467 state->srcfile &&
468 !strcmp(state->srcfile, srcfile) &&
469 state->line == line) {
470 free(srcfile);
471 return 0;
472 }
473
474 srccode = find_sourceline(srcfile, line, &len);
475 if (!srccode)
476 goto out_free_line;
477
478 ret = fprintf(fp, "|%-8d %.*s", line, len, srccode);
479 state->srcfile = srcfile;
^^^^^^^
480 state->line = line;
^^^^^^^
This patch validates 'state' pointer before access its elements.
Signed-off-by: Leo Yan <[email protected]>
Acked-by: Jiri Olsa <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Alexey Budankov <[email protected]>
Cc: Alexios Zavras <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Changbin Du <[email protected]>
Cc: David S. Miller <[email protected]>
Cc: Davidlohr Bueso <[email protected]>
Cc: Eric Saint-Etienne <[email protected]>
Cc: Jin Yao <[email protected]>
Cc: Konstantin Khlebnikov <[email protected]>
Cc: Mathieu Poirier <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Rasmus Villemoes <[email protected]>
Cc: Song Liu <[email protected]>
Cc: Suzuki Poulouse <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Thomas Richter <[email protected]>
Cc: [email protected]
Fixes: dd2e18e9ac20 ("perf tools: Support 'srccode' output")
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>
---
tools/perf/util/map.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c
index ee71efb9db62..9c81ee092784 100644
--- a/tools/perf/util/map.c
+++ b/tools/perf/util/map.c
@@ -470,8 +470,11 @@ int map__fprintf_srccode(struct map *map, u64 addr,
goto out_free_line;
ret = fprintf(fp, "|%-8d %.*s", line, len, srccode);
- state->srcfile = srcfile;
- state->line = line;
+
+ if (state) {
+ state->srcfile = srcfile;
+ state->line = line;
+ }
return ret;
out_free_line:
--
2.20.1
