The NBD spec says that behavior is unspecified if the client
requests 0 length for block status; but since the structured
reply is documenting as returning a non-zero length, it's
easier to just diagnose this with an EINVAL error than to
figure out what to return.
CC: qemu-stable@nongnu.org
Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <
20180621124937.166549-1-eblake@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
(cherry picked from commit
d8b20291cba6aa9bb295885a34f2b5f05d59d1b2)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
"discard failed", errp);
case NBD_CMD_BLOCK_STATUS:
+ if (!request->len) {
+ return nbd_send_generic_reply(client, request->handle, -EINVAL,
+ "need non-zero length", errp);
+ }
if (client->export_meta.valid && client->export_meta.base_allocation) {
return nbd_co_send_block_status(client, request->handle,
blk_bs(exp->blk), request->from,