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@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>

diff --git a/tools/lib/traceevent/event-parse.c b/tools/lib/traceevent/event-parse.c
index b36b536..13fd9fd 100644 (file)
--- 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;
 }