From: Steven Rostedt (VMware) <rostedt@xxxxxxxxxxx>
[ 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@xxxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: linux-trace-devel@xxxxxxxxxxxxxxx
Cc: stable@xxxxxxxxxxxxxxx
Link: http://lkml.kernel.org/r/20190828191819.970121417@xxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
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 df3c73e9dea49..9954b069b3ca2 100644
--- a/tools/lib/traceevent/event-parse.c
+++ b/tools/lib/traceevent/event-parse.c
@@ -265,10 +265,10 @@ static int add_new_comm(struct pevent *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;
}
@@ -279,7 +279,6 @@ static int add_new_comm(struct pevent *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
