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authorMarkus Armbruster <armbru@redhat.com>2016-04-27 16:29:08 +0200
committerMarkus Armbruster <armbru@redhat.com>2016-04-28 08:19:20 +0200
commitd9d3aaea0b3fbb5028e20316bdb93359487cd01f (patch)
tree694e1415d48f74546d9a2a925100040882ff1b56
parent37f32349ea43f41ee8b9a253977ce1e46f576fc7 (diff)
replay: Fix dangling location bug in replay_configure()
replay_configure() pushes and pops a Location with automatic storage duration. Except it fails to pop when -icount parameter "rr" isn't given. cur_loc then points to unused stack space, and will most likely get clobbered in short order. Clobbered cur_loc can make loc_pop() and error_print_loc() crash or report bogus locations. Broken in commit 890ad55. I didn't take the time to find a reproducer. Cc: Eduardo Habkost <ehabkost@redhat.com> Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-Id: <1461767349-15329-3-git-send-email-armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
-rw-r--r--replay/replay.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/replay/replay.c b/replay/replay.c
index 7c2573a612..167fd2942d 100644
--- a/replay/replay.c
+++ b/replay/replay.c
@@ -275,7 +275,7 @@ void replay_configure(QemuOpts *opts)
rr = qemu_opt_get(opts, "rr");
if (!rr) {
/* Just enabling icount */
- return;
+ goto out;
} else if (!strcmp(rr, "record")) {
mode = REPLAY_MODE_RECORD;
} else if (!strcmp(rr, "replay")) {
@@ -293,6 +293,7 @@ void replay_configure(QemuOpts *opts)
replay_enable(fname, mode);
+out:
loc_pop(&loc);
}