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[Qemu-devel] [PATCH v2 05/23] replay: Fix dangling location bug in repla

From: Stefan Hajnoczi
Subject: [Qemu-devel] [PATCH v2 05/23] replay: Fix dangling location bug in replay_configure()
Date: Mon, 9 May 2016 13:07:49 +0100

From: Markus Armbruster <address@hidden>

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 <address@hidden>
Signed-off-by: Markus Armbruster <address@hidden>
Message-Id: <address@hidden>
Reviewed-by: Eric Blake <address@hidden>
Reviewed-by: Eduardo Habkost <address@hidden>
 replay/replay.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/replay/replay.c b/replay/replay.c
index 7c2573a..167fd29 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);

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