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From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	stable@vger.kernel.org,
	"Steven Rostedt (VMware)" <rostedt@goodmis.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Jiri Olsa <jolsa@redhat.com>, Namhyung Kim <namhyung@kernel.org>,
	linux-trace-devel@vger.kernel.org,
	Arnaldo Carvalho de Melo <acme@redhat.com>,
	Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.19 083/114] tools lib traceevent: Do not free tep->cmdlines in add_new_comm() on failure
Date: Thu, 10 Oct 2019 10:36:30 +0200
Message-ID: <20191010083612.408800292@linuxfoundation.org> (raw)
In-Reply-To: <20191010083544.711104709@linuxfoundation.org>

From: Steven Rostedt (VMware) <rostedt@goodmis.org>

[ Upstream commit e0d2615856b2046c2e8d5bfd6933f37f69703b0b ]

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@goodmis.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: linux-trace-devel@vger.kernel.org
Cc: stable@vger.kernel.org
Link: http://lkml.kernel.org/r/20190828191819.970121417@goodmis.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 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 6ccfd13d5cf9c..382e476629fb1 100644
--- a/tools/lib/traceevent/event-parse.c
+++ b/tools/lib/traceevent/event-parse.c
@@ -254,10 +254,10 @@ static int add_new_comm(struct tep_handle *pevent, const char *comm, int pid)
 		errno = ENOMEM;
 		return -1;
 	}
+	pevent->cmdlines = cmdlines;
 
 	cmdlines[pevent->cmdline_count].comm = strdup(comm);
 	if (!cmdlines[pevent->cmdline_count].comm) {
-		free(cmdlines);
 		errno = ENOMEM;
 		return -1;
 	}
@@ -268,7 +268,6 @@ static int add_new_comm(struct tep_handle *pevent, const char *comm, int pid)
 		pevent->cmdline_count++;
 
 	qsort(cmdlines, pevent->cmdline_count, sizeof(*cmdlines), cmdline_cmp);
-	pevent->cmdlines = cmdlines;
 
 	return 0;
 }
-- 
2.20.1




      parent reply index

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20191010083544.711104709@linuxfoundation.org>
2019-10-10  8:35 ` [PATCH 4.19 030/114] tracing: Make sure variable reference alias has correct var_ref_idx Greg Kroah-Hartman
2019-10-10  8:36 ` Greg Kroah-Hartman [this message]

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