linux-kernel - [PATCH 3/5] perf tools: free 'printk' string in parse_ftrace

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Date:   Tue,  2 Oct 2018 10:29:12 -0400
From:   Sanskriti Sharma <sansharm@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     Jiri Olsa <jolsa@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Joe Lawrence <joe.lawrence@...hat.com>
Subject: [PATCH 3/5] perf tools: free 'printk' string in parse_ftrace_printk()

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>
---
 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 e76214f..b15a9bf 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);
 	}
 }

-- 
1.8.3.1