lguest: fix descriptor corruption in example launcher

1d589bb16b825b3a7b4edd34d997f1f1f953033d "Add serial number support
for virtio_blk, V4a" extended 'struct virtio_blk_config' to 536 bytes.
Lguest and S/390 both use an 8 bit value for the feature length, and
this change broke them (if the code is naive).

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: John Cooper <john.cooper@redhat.com>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>

diff --git a/Documentation/lguest/lguest.c b/Documentation/lguest/lguest.c
index 9ebcd6e..45d7d6d 100644 (file)
--- a/Documentation/lguest/lguest.c
+++ b/Documentation/lguest/lguest.c
@@ -1105,6 +1105,9 @@ static void set_config(struct device *dev, unsigned len, const void *conf)
        /* Copy in the config information, and store the length. */
        memcpy(device_config(dev), conf, len);
        dev->desc->config_len = len;
+
+       /* Size must fit in config_len field (8 bits)! */
+       assert(dev->desc->config_len == len);
 }
 
 /* This routine does all the creation and setup of a new device, including
@@ -1515,7 +1518,8 @@ static void setup_block_file(const char *filename)
        add_feature(dev, VIRTIO_BLK_F_SEG_MAX);
        conf.seg_max = cpu_to_le32(VIRTQUEUE_NUM - 2);
 
-       set_config(dev, sizeof(conf), &conf);
+       /* Don't try to put whole struct: we have 8 bit limit. */
+       set_config(dev, offsetof(struct virtio_blk_config, geometry), &conf);
 
        verbose("device %u: virtblock %llu sectors\n",
                ++devices.device_num, le64_to_cpu(conf.capacity));