[Qemu-devel] [PATCH 13/16] nbd: avoid uninitialized warnings

[Gerd Hoffmann <kraxel@redhat.com>]

From: Marc-André Lureau <marcandre.lureau@gmail.com>

==15815== Thread 1:
==15815== Syscall param socketcall.sendto(msg) points to uninitialised byte(s)
==15815==    at 0x65AD5CB: send (send.c:31)
==15815==    by 0x37F84B: nbd_wr_sync (nbd.c:145)
==15815==    by 0x37F94B: write_sync (nbd.c:186)
==15815==    by 0x380FA9: nbd_send_request (nbd.c:681)
==15815==    by 0x1C4A2D: nbd_teardown_connection (nbd-client.c:337)
==15815==    by 0x1C4AD8: nbd_client_session_close (nbd-client.c:354)
==15815==    by 0x1ED2D8: close_socketpair (spicebd.c:132)
==15815==    by 0x1EE265: spice_close (spicebd.c:457)
==15815==    by 0x1ACBF6: bdrv_close (block.c:1519)
==15815==    by 0x1AD804: bdrv_delete (block.c:1772)
==15815==    by 0x1B4136: bdrv_unref (block.c:4476)
==15815==    by 0x1ACCE0: bdrv_close (block.c:1541)
==15815==  Address 0x7feffef98 is on thread 1's stack

Signed-off-by: Marc-André Lureau <marcandre.lureau@gmail.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 block/nbd-client.c | 21 +++++++++------------
 1 file changed, 9 insertions(+), 12 deletions(-)

diff --git a/block/nbd-client.c b/block/nbd-client.c
index 1973cf0..0922b78 100644
--- a/block/nbd-client.c
+++ b/block/nbd-client.c
@@ -185,11 +185,10 @@ static int nbd_co_readv_1(NbdClientSession *client, int64_t sector_num,
                           int nb_sectors, QEMUIOVector *qiov,
                           int offset)
 {
-    struct nbd_request request;
+    struct nbd_request request = { .type = NBD_CMD_READ };
     struct nbd_reply reply;
     ssize_t ret;
 
-    request.type = NBD_CMD_READ;
     request.from = sector_num * 512;
     request.len = nb_sectors * 512;
 
@@ -209,11 +208,10 @@ static int nbd_co_writev_1(NbdClientSession *client, int64_t sector_num,
                            int nb_sectors, QEMUIOVector *qiov,
                            int offset)
 {
-    struct nbd_request request;
+    struct nbd_request request = { .type = NBD_CMD_WRITE };
     struct nbd_reply reply;
     ssize_t ret;
 
-    request.type = NBD_CMD_WRITE;
     if (!bdrv_enable_write_cache(client->bs) &&
         (client->nbdflags & NBD_FLAG_SEND_FUA)) {
         request.type |= NBD_CMD_FLAG_FUA;
@@ -275,7 +273,7 @@ int nbd_client_session_co_writev(NbdClientSession *client, int64_t sector_num,
 
 int nbd_client_session_co_flush(NbdClientSession *client)
 {
-    struct nbd_request request;
+    struct nbd_request request = { .type = NBD_CMD_FLUSH };
     struct nbd_reply reply;
     ssize_t ret;
 
@@ -283,7 +281,6 @@ int nbd_client_session_co_flush(NbdClientSession *client)
         return 0;
     }
 
-    request.type = NBD_CMD_FLUSH;
     if (client->nbdflags & NBD_FLAG_SEND_FUA) {
         request.type |= NBD_CMD_FLAG_FUA;
     }
@@ -305,14 +302,13 @@ int nbd_client_session_co_flush(NbdClientSession *client)
 int nbd_client_session_co_discard(NbdClientSession *client, int64_t sector_num,
     int nb_sectors)
 {
-    struct nbd_request request;
+    struct nbd_request request = { .type = NBD_CMD_TRIM };
     struct nbd_reply reply;
     ssize_t ret;
 
     if (!(client->nbdflags & NBD_FLAG_SEND_TRIM)) {
         return 0;
     }
-    request.type = NBD_CMD_TRIM;
     request.from = sector_num * 512;
     request.len = nb_sectors * 512;
 
@@ -330,11 +326,12 @@ int nbd_client_session_co_discard(NbdClientSession *client, int64_t sector_num,
 
 static void nbd_teardown_connection(NbdClientSession *client)
 {
-    struct nbd_request request;
+    struct nbd_request request = {
+        .type = NBD_CMD_DISC,
+        .from = 0,
+        .len = 0
+    };
 
-    request.type = NBD_CMD_DISC;
-    request.from = 0;
-    request.len = 0;
     nbd_send_request(client->sock, &request);
 
     /* finish any pending coroutines */
-- 
1.8.3.1