[Qemu-devel] [PULL 1/3] nbd: Fix 32-bit compilation on BLOCK_STATUS

[Eric Blake <eblake@redhat.com>]

iotests 123 and 209 fail on 32-bit platforms.  The culprit:
sizeof(extent) is wrong; we want sizeof(*extent).  But since
the struct is 8 bytes, it happened to work on 64-bit platforms
where the pointer is also 8 bytes (nasty).

Fixes: 78a33ab58
Reported-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <20180327210517.1804242-1-eblake@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
---
 block/nbd-client.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/block/nbd-client.c b/block/nbd-client.c
index e64e346d690..e7caf49fbb4 100644
--- a/block/nbd-client.c
+++ b/block/nbd-client.c
@@ -239,7 +239,7 @@ static int nbd_parse_blockstatus_payload(NBDClientSession *client,
 {
     uint32_t context_id;

-    if (chunk->length != sizeof(context_id) + sizeof(extent)) {
+    if (chunk->length != sizeof(context_id) + sizeof(*extent)) {
         error_setg(errp, "Protocol error: invalid payload for "
                          "NBD_REPLY_TYPE_BLOCK_STATUS");
         return -EINVAL;
-- 
2.14.3