From 04cfac4e40b2b5dbaf8c0fc625878388a98bb9c6 Mon Sep 17 00:00:00 2001 From: Hani Benhabiles Date: Fri, 6 Jun 2014 14:38:30 -0700 Subject: [PATCH] nbd: zero from and len fields in NBD_CMD_DISCONNECT. Len field is already set to zero, but not the from field which is sent as 0xfffffffffffffe00. This makes no sense, and may cause confuse server implementations doing sanity checks (qemu-nbd is an example.) Signed-off-by: Hani Benhabiles Cc: Paul Clements Cc: Paul Clements Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/block/nbd.c | 7 ++----- 1 file changed, 2 insertions(+), 5 deletions(-) diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c index 56a027d6115e..fb31b8ee4372 100644 --- a/drivers/block/nbd.c +++ b/drivers/block/nbd.c @@ -243,14 +243,11 @@ static int nbd_send_req(struct nbd_device *nbd, struct request *req) struct nbd_request request; unsigned long size = blk_rq_bytes(req); + memset(&request, 0, sizeof(request)); request.magic = htonl(NBD_REQUEST_MAGIC); request.type = htonl(nbd_cmd(req)); - if (nbd_cmd(req) == NBD_CMD_FLUSH) { - /* Other values are reserved for FLUSH requests. */ - request.from = 0; - request.len = 0; - } else { + if (nbd_cmd(req) != NBD_CMD_FLUSH && nbd_cmd(req) != NBD_CMD_DISC) { request.from = cpu_to_be64((u64)blk_rq_pos(req) << 9); request.len = htonl(size); }