From: Kevin Wolf <kwolf@redhat.com>
Date: Tue, 9 Apr 2013 11:19:18 +0000 (+0200)
Subject: block: Fail gracefully when using a format driver on protocol level
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=2af5ef70af9fdc823407ddc4ae14766806d4837a;p=osstest%2Fqemu.git

block: Fail gracefully when using a format driver on protocol level

Specifying the wrong driver could fail an assertion:

$ qemu-system-x86_64 -drive file.driver=qcow2,file=x
qemu-system-x86_64: block.c:721: bdrv_open_common: Assertion `file !=
((void *)0)' failed.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---

diff --git a/block.c b/block.c
index 4ad663d3f..bea47c475 100644
--- a/block.c
+++ b/block.c
@@ -718,6 +718,13 @@ static int bdrv_open_common(BlockDriverState *bs, BlockDriverState *file,
         assert(drv->bdrv_parse_filename || filename != NULL);
         ret = drv->bdrv_file_open(bs, filename, options, open_flags);
     } else {
+        if (file == NULL) {
+            qerror_report(ERROR_CLASS_GENERIC_ERROR, "Can't use '%s' as a "
+                          "block driver for the protocol level",
+                          drv->format_name);
+            ret = -EINVAL;
+            goto free_and_fail;
+        }
         assert(file != NULL);
         bs->file = file;
         ret = drv->bdrv_open(bs, options, open_flags);
diff --git a/tests/qemu-iotests/051 b/tests/qemu-iotests/051
index 8b51de3f3..8039e23ab 100755
--- a/tests/qemu-iotests/051
+++ b/tests/qemu-iotests/051
@@ -142,6 +142,13 @@ run_qemu -drive media=cdrom,cache=writethrough
 run_qemu -drive media=cdrom,cache=unsafe
 run_qemu -drive media=cdrom,cache=invalid_value
 
+echo
+echo === Specifying the protocol layer ===
+echo
+
+run_qemu -drive file=$TEST_IMG,file.driver=file
+run_qemu -drive file=$TEST_IMG,file.driver=qcow2
+
 # success, all done
 echo "*** done"
 rm -f $seq.full
diff --git a/tests/qemu-iotests/051.out b/tests/qemu-iotests/051.out
index 48456d5b0..3d1ac7b7d 100644
--- a/tests/qemu-iotests/051.out
+++ b/tests/qemu-iotests/051.out
@@ -159,4 +159,14 @@ qququiquit
 Testing: -drive media=cdrom,cache=invalid_value
 QEMU_PROG: -drive media=cdrom,cache=invalid_value: invalid cache option
 
+
+=== Specifying the protocol layer ===
+
+Testing: -drive file=TEST_DIR/t.qcow2,file.driver=file
+qququiquit
+
+Testing: -drive file=TEST_DIR/t.qcow2,file.driver=qcow2
+QEMU_PROG: -drive file=TEST_DIR/t.qcow2,file.driver=qcow2: Can't use 'qcow2' as a block driver for the protocol level
+QEMU_PROG: -drive file=TEST_DIR/t.qcow2,file.driver=qcow2: could not open disk image TEST_DIR/t.qcow2: Invalid argument
+
 *** done