[tip: perf/core] perf script: Avoid NULL dereference on symbol

[tip-bot2 for Ian Rogers]

The following commit has been merged into the perf/core branch of tip:

Commit-ID:     1e76b171b71565b96117c2670c64ba54e36a9c2e
Gitweb:        https://git.kernel.org/tip/1e76b171b71565b96117c2670c64ba54e36a9c2e
Author:        Ian Rogers <irogers@xxxxxxxxxx>
AuthorDate:    Mon, 20 Apr 2020 17:43:29 -07:00
Committer:     Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitterDate: Wed, 22 Apr 2020 10:59:02 -03:00

perf script: Avoid NULL dereference on symbol

al->sym may be NULL given current if conditions and may cause a segv.

Fixes: d2bedb7863e9 ("perf script: Allow --symbol to accept hexadecimal addresses")
Signed-off-by: Ian Rogers <irogers@xxxxxxxxxx>
Acked-by: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
Cc: Mark Rutland <mark.rutland@xxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Stephane Eranian <eranian@xxxxxxxxxx>
Link: http://lore.kernel.org/lkml/20200421004329.43109-1-irogers@xxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 tools/perf/util/event.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
index dc0e112..f581550 100644
--- a/tools/perf/util/event.c
+++ b/tools/perf/util/event.c
@@ -626,7 +626,7 @@ int machine__resolve(struct machine *machine, struct addr_location *al,
 			ret = strlist__has_entry(symbol_conf.sym_list,
 						al->sym->name);
 		}
-		if (!(ret && al->sym)) {
+		if (!ret && al->sym) {
 			snprintf(al_addr_str, sz, "0x%"PRIx64,
 				al->map->unmap_ip(al->map, al->sym->start));
 			ret = strlist__has_entry(symbol_conf.sym_list,