linux-kernel - [tip: perf/core] tools lib traceevent: Do not free tep->cmdlines in add_new

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Message-ID: <156710532322.10616.13881273316209901553.tip-bot2@tip-bot2>
Date:   Thu, 29 Aug 2019 19:02:03 -0000
From:   "tip-bot2 for Steven Rostedt (VMware)" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     "Steven Rostedt (VMware)" <rostedt@...dmis.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-trace-devel@...r.kernel.org, stable@...r.kernel.org,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Ingo Molnar <mingo@...nel.org>, Borislav Petkov <bp@...en8.de>,
        linux-kernel@...r.kernel.org
Subject: [tip: perf/core] tools lib traceevent: Do not free tep->cmdlines in
 add_new_comm() on failure

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

Commit-ID:     b0215e2d6a18d8331b2d4a8b38ccf3eff783edb1
Gitweb:        https://git.kernel.org/tip/b0215e2d6a18d8331b2d4a8b38ccf3eff783edb1
Author:        Steven Rostedt (VMware) <rostedt@...dmis.org>
AuthorDate:    Wed, 28 Aug 2019 15:05:28 -04:00
Committer:     Arnaldo Carvalho de Melo <acme@...hat.com>
CommitterDate: Thu, 29 Aug 2019 08:36:12 -03:00

tools lib traceevent: Do not free tep->cmdlines in add_new_comm() on failure

If the re-allocation of tep->cmdlines succeeds, then the previous
allocation of tep->cmdlines will be freed. If we later fail in
add_new_comm(), we must not free cmdlines, and also should assign
tep->cmdlines to the new allocation. Otherwise when freeing tep, the
tep->cmdlines will be pointing to garbage.

Fixes: a6d2a61ac653a ("tools lib traceevent: Remove some die() calls")
Signed-off-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: linux-trace-devel@...r.kernel.org
Cc: stable@...r.kernel.org
Link: http://lkml.kernel.org/r/20190828191819.970121417@goodmis.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/lib/traceevent/event-parse.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/tools/lib/traceevent/event-parse.c b/tools/lib/traceevent/event-parse.c
index b36b536..13fd9fd 100644
--- a/tools/lib/traceevent/event-parse.c
+++ b/tools/lib/traceevent/event-parse.c
@@ -269,10 +269,10 @@ static int add_new_comm(struct tep_handle *tep,
 		errno = ENOMEM;
 		return -1;
 	}
+	tep->cmdlines = cmdlines;
 
 	cmdlines[tep->cmdline_count].comm = strdup(comm);
 	if (!cmdlines[tep->cmdline_count].comm) {
-		free(cmdlines);
 		errno = ENOMEM;
 		return -1;
 	}
@@ -283,7 +283,6 @@ static int add_new_comm(struct tep_handle *tep,
 		tep->cmdline_count++;
 
 	qsort(cmdlines, tep->cmdline_count, sizeof(*cmdlines), cmdline_cmp);
-	tep->cmdlines = cmdlines;
 
 	return 0;
 }