From c3ca988d2b0ee94dc8d53eff4b1c2de4ac06a270 Mon Sep 17 00:00:00 2001 From: Kevin Wolf Date: Thu, 25 Apr 2013 15:59:27 +0200 Subject: rbd: Fix use after free in rbd_open() Commit a9ccedc3 frees the QemuOpts for the driver-specific options immediately, even though it still needs the filename string that is contained there. This doesn't work. Move the deletion of the QemuOpts to the end of the function where its content isn't needed any more. Signed-off-by: Kevin Wolf Reviewed-by: Eric Blake Signed-off-by: Stefan Hajnoczi --- block/rbd.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) (limited to 'block/rbd.c') diff --git a/block/rbd.c b/block/rbd.c index 1826411492..0f2608b287 100644 --- a/block/rbd.c +++ b/block/rbd.c @@ -478,20 +478,20 @@ static int qemu_rbd_open(BlockDriverState *bs, QDict *options, int flags) } filename = qemu_opt_get(opts, "filename"); - qemu_opts_del(opts); if (qemu_rbd_parsename(filename, pool, sizeof(pool), snap_buf, sizeof(snap_buf), s->name, sizeof(s->name), conf, sizeof(conf)) < 0) { - return -EINVAL; + r = -EINVAL; + goto failed_opts; } clientname = qemu_rbd_parse_clientname(conf, clientname_buf); r = rados_create(&s->cluster, clientname); if (r < 0) { error_report("error initializing"); - return r; + goto failed_opts; } s->snap = NULL; @@ -557,6 +557,7 @@ static int qemu_rbd_open(BlockDriverState *bs, QDict *options, int flags) NULL, qemu_rbd_aio_flush_cb, s); + qemu_opts_del(opts); return 0; failed: @@ -566,6 +567,8 @@ failed_open: failed_shutdown: rados_shutdown(s->cluster); g_free(s->snap); +failed_opts: + qemu_opts_del(opts); return r; } -- cgit v1.2.3