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[PULL,1/4] nbd/client: fix nbd_negotiate_simple_meta_context

Message ID 20180504133034.1328397-2-eblake@redhat.com
State New
Headers show
Series [PULL,1/4] nbd/client: fix nbd_negotiate_simple_meta_context | expand

Commit Message

Eric Blake May 4, 2018, 1:30 p.m. UTC 
From: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>

Initialize received variable. Otherwise, is is possible for server to
answer without any contexts, but we will set context_id to something
random (received_id is not initialized too) and return 1, which is
wrong.

To solve it, just initialize received to false. Initialize received_id
too, just to make all possible checkers happy.

Bug was introduced in 78a33ab58782efdb206de14 "nbd: BLOCK_STATUS for
standard get_block_status function: client part" with the whole
function.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id: <20180427142002.21930-2-vsementsov@virtuozzo.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
CC: qemu-stable@nongnu.org
Signed-off-by: Eric Blake <eblake@redhat.com>
---
 nbd/client.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
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Patch

diff --git a/nbd/client.c b/nbd/client.c
index b9e175d1c27..7f35b5c3232 100644
--- a/nbd/client.c
+++ b/nbd/client.c
@@ -613,8 +613,8 @@  static int nbd_negotiate_simple_meta_context(QIOChannel *ioc,
 {
     int ret;
     NBDOptionReply reply;
-    uint32_t received_id;
-    bool received;
+    uint32_t received_id = 0;
+    bool received = false;
     uint32_t export_len = strlen(export);
     uint32_t context_len = strlen(context);
     uint32_t data_len = sizeof(export_len) + export_len +