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authorLeo Yan <leo.yan@linaro.org>2019-07-02 18:34:16 +0800
committerArnaldo Carvalho de Melo <acme@redhat.com>2019-07-09 09:33:55 -0300
commit363bbaef63ffebcc745239fe80a953ebb5ac9ec9 (patch)
tree3c50f7ba9963fe8014c4ef6f21e77b5ce0b74e0c /tools/perf
parent7a6d49dc8cad8fa1f3d63994102af8f9ae9c859f (diff)
downloadlinux-363bbaef63ffebcc745239fe80a953ebb5ac9ec9.tar.bz2
perf map: Fix potential NULL pointer dereference found by smatch tool
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 <leo.yan@linaro.org> Acked-by: Jiri Olsa <jolsa@kernel.org> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Alexey Budankov <alexey.budankov@linux.intel.com> Cc: Alexios Zavras <alexios.zavras@intel.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: Changbin Du <changbin.du@intel.com> Cc: David S. Miller <davem@davemloft.net> Cc: Davidlohr Bueso <dave@stgolabs.net> Cc: Eric Saint-Etienne <eric.saint.etienne@oracle.com> Cc: Jin Yao <yao.jin@linux.intel.com> Cc: Konstantin Khlebnikov <khlebnikov@yandex-team.ru> Cc: Mathieu Poirier <mathieu.poirier@linaro.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk> Cc: Song Liu <songliubraving@fb.com> Cc: Suzuki Poulouse <suzuki.poulose@arm.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Thomas Richter <tmricht@linux.ibm.com> Cc: linux-arm-kernel@lists.infradead.org Fixes: dd2e18e9ac20 ("perf tools: Support 'srccode' output") Link: http://lkml.kernel.org/r/20190702103420.27540-8-leo.yan@linaro.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf')
-rw-r--r--tools/perf/util/map.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c
index 6fce983c6115..5f87975d2562 100644
--- a/tools/perf/util/map.c
+++ b/tools/perf/util/map.c
@@ -476,8 +476,11 @@ 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: