From 140acbb093844308f693ce2e3b53b3f2c61ca16c Mon Sep 17 00:00:00 2001 From: "Steven Rostedt (VMware)" Date: Wed, 28 Aug 2019 15:05:28 -0400 Subject: [PATCH] tools lib traceevent: Do not free tep->cmdlines in add_new_comm() on failure [ 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) Cc: Andrew Morton Cc: Jiri Olsa Cc: Namhyung Kim 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 Signed-off-by: Sasha Levin --- 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 6ccfd13d5cf9..382e476629fb 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; } -- GitLab