qemu-img: Fix crash in amend invocation

Example:
$ ./qemu-img create -f qcow2 /tmp/t.qcow2 64M
$ ./qemu-img amend -f qcow2 -o backing_file=/tmp/t.qcow2, -o help \
    /tmp/t.qcow2

This should not crash. This actually is tested by iotest 082, but not
caught due to the segmentation fault being silent (which is something
that needs to be fixed, too).

Reported-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Cc: qemu-stable <qemu-stable@nongnu.org>
Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/qemu-img.c b/qemu-img.c
index 75f4ee4..6ff4e85 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -2931,7 +2931,7 @@ static int img_amend(int argc, char **argv)
                 if (!is_valid_option_list(optarg)) {
                     error_report("Invalid option list: %s", optarg);
                     ret = -1;
-                    goto out;
+                    goto out_no_progress;
                 }
                 if (!options) {
                     options = g_strdup(optarg);
@@ -3031,6 +3031,7 @@ static int img_amend(int argc, char **argv)
 out:
     qemu_progress_end();
 
+out_no_progress:
     blk_unref(blk);
     qemu_opts_del(opts);
     qemu_opts_free(create_opts);