linux-kernel - [PATCH AUTOSEL 4.19 020/146] perf tools: Free 'printk' string in parse_ftrace

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Message-Id: <20181031230541.28822-20-sashal@kernel.org>
Date:   Wed, 31 Oct 2018 19:03:35 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     stable@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Sanskriti Sharma <sansharm@...hat.com>,
        Joe Lawrence <joe.lawrence@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 4.19 020/146] perf tools: Free 'printk' string in parse_ftrace_printk()

From: Sanskriti Sharma <sansharm@...hat.com>

[ Upstream commit 9c8a182e5a73e01afd11742a2ab887bf338fdafd ]

parse_ftrace_printk() tokenizes and parses a line, calling strdup() each
iteration.  Add code to free this temporary format string duplicate.

Fixes the following coverity complaints:

  Error: RESOURCE_LEAK (CWE-772):
  tools/perf/util/trace-event-parse.c:158: overwrite_var: Overwriting
  "printk" in "printk = strdup(fmt + 1)" leaks the storage that "printk"
  points to.

  tools/perf/util/trace-event-parse.c:162: leaked_storage: Variable
  "printk" going out of scope leaks the storage it points to.

Signed-off-by: Sanskriti Sharma <sansharm@...hat.com>
Reviewed-by: Jiri Olsa <jolsa@...nel.org>
Cc: Joe Lawrence <joe.lawrence@...hat.com>
Link: http://lkml.kernel.org/r/1538490554-8161-4-git-send-email-sansharm@redhat.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 tools/perf/util/trace-event-parse.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/perf/util/trace-event-parse.c b/tools/perf/util/trace-event-parse.c
index e76214f8d596..b15a9bf1837b 100644
--- a/tools/perf/util/trace-event-parse.c
+++ b/tools/perf/util/trace-event-parse.c
@@ -158,6 +158,7 @@ void parse_ftrace_printk(struct tep_handle *pevent,
 		printk = strdup(fmt+1);
 		line = strtok_r(NULL, "\n", &next);
 		tep_register_print_string(pevent, printk, addr);
+		free(printk);
 	}
 }
 
-- 
2.17.1