block: Don't silently truncate node names

If the user passes a too long node name string, we silently truncate it
to fit into BlockDriverState.node_name, i.e. to 31 characters. Apart
from surprising the user when the node has a different name than
requested, this also bypasses the check for duplicate names, so that the
same name can be assigned to multiple nodes.

Fix this by just making too long node names an error.

Reported-by: Peter Krempa <pkrempa@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

diff --git a/block.c b/block.c
index 961ec97d26f1d81964d66fad32369df6435bd292..ac8b3a3511e9fdb49622c70708828a50aa81ae35 100644 (file)
--- a/block.c
+++ b/block.c
@@ -1156,6 +1156,12 @@ static void bdrv_assign_node_name(BlockDriverState *bs,
         goto out;
     }
 
+    /* Make sure that the node name isn't truncated */
+    if (strlen(node_name) >= sizeof(bs->node_name)) {
+        error_setg(errp, "Node name too long");
+        goto out;
+    }
+
     /* copy node name into the bs and insert it into the graph list */
     pstrcpy(bs->node_name, sizeof(bs->node_name), node_name);
     QTAILQ_INSERT_TAIL(&graph_bdrv_states, bs, node_list);

diff --git a/tests/qemu-iotests/051 b/tests/qemu-iotests/051
index f617e25e24a427da86e137550734f15a96a615e5..ee9c820d0f8e37e851e716130b11ed1b051b4418 100755 (executable)
--- a/tests/qemu-iotests/051
+++ b/tests/qemu-iotests/051
@@ -99,6 +99,21 @@ run_qemu -drive file="$TEST_IMG",driver=foo
 run_qemu -drive file="$TEST_IMG",driver=raw,format=qcow2
 run_qemu -drive file="$TEST_IMG",driver=qcow2,format=qcow2
 
+echo
+echo === Node names ===
+echo
+
+# Maximum length: 31 characters
+run_qemu -drive file="$TEST_IMG",node-name=x123456789012345678901234567890
+run_qemu -drive file="$TEST_IMG",node-name=x1234567890123456789012345678901
+
+# First character must be alphabetic
+# Following characters alphanumeric or -._
+run_qemu -drive file="$TEST_IMG",node-name=All-Types.of_all0wed_chars
+run_qemu -drive file="$TEST_IMG",node-name=123foo
+run_qemu -drive file="$TEST_IMG",node-name=_foo
+run_qemu -drive file="$TEST_IMG",node-name=foo#12
+
 echo
 echo === Device without drive ===
 echo

diff --git a/tests/qemu-iotests/051.out b/tests/qemu-iotests/051.out
index dd9846d1ce595362cdf9a049740431d3560c6302..b7273505c7fe98e1a810c1f005c5cafea4a09e96 100644 (file)
--- a/tests/qemu-iotests/051.out
+++ b/tests/qemu-iotests/051.out
@@ -47,6 +47,29 @@ Testing: -drive file=TEST_DIR/t.qcow2,driver=qcow2,format=qcow2
 QEMU_PROG: -drive file=TEST_DIR/t.qcow2,driver=qcow2,format=qcow2: Cannot specify both 'driver' and 'format'
 
 
+=== Node names ===
+
+Testing: -drive file=TEST_DIR/t.qcow2,node-name=x123456789012345678901234567890
+QEMU X.Y.Z monitor - type 'help' for more information
+(qemu) quit
+
+Testing: -drive file=TEST_DIR/t.qcow2,node-name=x1234567890123456789012345678901
+QEMU_PROG: -drive file=TEST_DIR/t.qcow2,node-name=x1234567890123456789012345678901: Node name too long
+
+Testing: -drive file=TEST_DIR/t.qcow2,node-name=All-Types.of_all0wed_chars
+QEMU X.Y.Z monitor - type 'help' for more information
+(qemu) quit
+
+Testing: -drive file=TEST_DIR/t.qcow2,node-name=123foo
+QEMU_PROG: -drive file=TEST_DIR/t.qcow2,node-name=123foo: Invalid node name
+
+Testing: -drive file=TEST_DIR/t.qcow2,node-name=_foo
+QEMU_PROG: -drive file=TEST_DIR/t.qcow2,node-name=_foo: Invalid node name
+
+Testing: -drive file=TEST_DIR/t.qcow2,node-name=foo#12
+QEMU_PROG: -drive file=TEST_DIR/t.qcow2,node-name=foo#12: Invalid node name
+
+
 === Device without drive ===
 
 Testing: -device VIRTIO_SCSI -device scsi-hd

diff --git a/tests/qemu-iotests/051.pc.out b/tests/qemu-iotests/051.pc.out
index b01f9a90d7b972651fe44332289a1b8772c5e5ae..e9257fe3189d46d7414db08c3f0c6883adc22bba 100644 (file)
--- a/tests/qemu-iotests/051.pc.out
+++ b/tests/qemu-iotests/051.pc.out
@@ -47,6 +47,29 @@ Testing: -drive file=TEST_DIR/t.qcow2,driver=qcow2,format=qcow2
 QEMU_PROG: -drive file=TEST_DIR/t.qcow2,driver=qcow2,format=qcow2: Cannot specify both 'driver' and 'format'
 
 
+=== Node names ===
+
+Testing: -drive file=TEST_DIR/t.qcow2,node-name=x123456789012345678901234567890
+QEMU X.Y.Z monitor - type 'help' for more information
+(qemu) quit
+
+Testing: -drive file=TEST_DIR/t.qcow2,node-name=x1234567890123456789012345678901
+QEMU_PROG: -drive file=TEST_DIR/t.qcow2,node-name=x1234567890123456789012345678901: Node name too long
+
+Testing: -drive file=TEST_DIR/t.qcow2,node-name=All-Types.of_all0wed_chars
+QEMU X.Y.Z monitor - type 'help' for more information
+(qemu) quit
+
+Testing: -drive file=TEST_DIR/t.qcow2,node-name=123foo
+QEMU_PROG: -drive file=TEST_DIR/t.qcow2,node-name=123foo: Invalid node name
+
+Testing: -drive file=TEST_DIR/t.qcow2,node-name=_foo
+QEMU_PROG: -drive file=TEST_DIR/t.qcow2,node-name=_foo: Invalid node name
+
+Testing: -drive file=TEST_DIR/t.qcow2,node-name=foo#12
+QEMU_PROG: -drive file=TEST_DIR/t.qcow2,node-name=foo#12: Invalid node name
+
+
 === Device without drive ===
 
 Testing: -device VIRTIO_SCSI -device scsi-hd