linux-kernel - [tip:perf/urgent] perf annotate: Plug filename string leak

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Message-ID: <tip-qi4rpjq8yo6myvg99kkgt0xz@git.kernel.org>
Date:	Thu, 4 Aug 2016 02:09:51 -0700
From:	tip-bot for Arnaldo Carvalho de Melo <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	acme@...hat.com, mingo@...nel.org, hpa@...or.com,
	adrian.hunter@...el.com, tglx@...utronix.de, dsahern@...il.com,
	linux-kernel@...r.kernel.org, jolsa@...nel.org,
	wangnan0@...wei.com, namhyung@...nel.org
Subject: [tip:perf/urgent] perf annotate: Plug filename string leak

Commit-ID:  c17c17e8c26a5d44b3a8a6ef8c55233d72eed6c0
Gitweb:     http://git.kernel.org/tip/c17c17e8c26a5d44b3a8a6ef8c55233d72eed6c0
Author:     Arnaldo Carvalho de Melo <acme@...hat.com>
AuthorDate: Mon, 1 Aug 2016 18:49:13 -0300
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Mon, 1 Aug 2016 18:49:13 -0300

perf annotate: Plug filename string leak

If dso__build_id_filename(..., NULL, ...) returns !NULL its because it
allocated it, so, when reaching the  'if (dso__is_kcore()) test, we
already checked that and were just "fallbacking" to using
dso->long_name, but without freeing filename, thus leaking it.

Fix it by adding the dso__is_kcore() test to the 'or' group just after
it, the one containing the full fallback code, including freeing the
filename.

Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: David Ahern <dsahern@...il.com>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Wang Nan <wangnan0@...wei.com>
Fixes: ee205503f233 ("perf tools: Fix annotation with kcore")
Link: http://lkml.kernel.org/n/tip-qi4rpjq8yo6myvg99kkgt0xz@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/annotate.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
index 4982ed4..4024d30 100644
--- a/tools/perf/util/annotate.c
+++ b/tools/perf/util/annotate.c
@@ -1185,9 +1185,8 @@ int symbol__disassemble(struct symbol *sym, struct map *map, size_t privsize)
 		if (dso->has_build_id)
 			return ENOMEM;
 		goto fallback;
-	} else if (dso__is_kcore(dso)) {
-		goto fallback;
-	} else if (readlink(symfs_filename, command, sizeof(command)) < 0 ||
+	} else if (dso__is_kcore(dso) ||
+		   readlink(symfs_filename, command, sizeof(command)) < 0 ||
 		   strstr(command, DSO__NAME_KALLSYMS) ||
 		   access(symfs_filename, R_OK)) {
 		free(filename);