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From: Eric Blake <eblake@redhat.com>
To: qemu-devel@nongnu.org
Cc: mreitz@redhat.com, vsementsov@virtuozzo.com,
	qemu-block@nongnu.org, Paolo Bonzini <pbonzini@redhat.com>,
	Kevin Wolf <kwolf@redhat.com>
Subject: [Qemu-devel] [PATCH for-2.12] nbd: Fix 32-bit compilation on BLOCK_STATUS
Date: Tue, 27 Mar 2018 16:05:17 -0500	[thread overview]
Message-ID: <20180327210517.1804242-1-eblake@redhat.com> (raw)

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>
---
 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

             reply	other threads:[~2018-03-27 21:05 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-03-27 21:05 Eric Blake [this message]
2018-03-27 22:13 ` [Qemu-devel] [PATCH for-2.12] nbd: Fix 32-bit compilation on BLOCK_STATUS Paolo Bonzini
2018-03-28  8:51 ` Vladimir Sementsov-Ogievskiy

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