From: Max Reitz <mreitz@redhat.com>
Date: Tue, 2 Dec 2014 17:32:46 +0000 (+0100)
Subject: qemu-img: Check create_opts before image creation
X-Git-Tag: qemu-xen-4.6.0-rc1~34^2~49
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=10be14ee7d1d82e439f0fab69e32c90427afa07c;p=qemu-upstream-4.6-testing.git

qemu-img: Check create_opts before image creation

If a driver supports image creation, it needs to set the .create_opts
field. We can use that to make sure .create_opts for both drivers
involved is not NULL for the target image in qemu-img convert, which is
important so that the create_opts pointer in img_convert() is not NULL
after the qemu_opts_append() calls and when going into
qemu_opts_create().

Cc: qemu-stable@nongnu.org
Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
(cherry picked from commit f75613cf2488a37fb8019bc32a06ddbcd477d0ce)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
---

diff --git a/qemu-img.c b/qemu-img.c
index a42335c63..8c4edf37a 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -1531,6 +1531,20 @@ static int img_convert(int argc, char **argv)
         goto out;
     }
 
+    if (!drv->create_opts) {
+        error_report("Format driver '%s' does not support image creation",
+                     drv->format_name);
+        ret = -1;
+        goto out;
+    }
+
+    if (!proto_drv->create_opts) {
+        error_report("Protocol driver '%s' does not support image creation",
+                     proto_drv->format_name);
+        ret = -1;
+        goto out;
+    }
+
     create_opts = qemu_opts_append(create_opts, drv->create_opts);
     create_opts = qemu_opts_append(create_opts, proto_drv->create_opts);