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

[Paolo Bonzini <pbonzini@redhat.com>]

Il 29/11/2013 15:58, Marc-André Lureau ha scritto:
> ==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>
> ---
>  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 ad6fb01..82806f1 100644
> --- a/block/nbd-client.c
> +++ b/block/nbd-client.c
> @@ -186,11 +186,10 @@ 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;
>  
> @@ -210,11 +209,10 @@ 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;
> @@ -276,7 +274,7 @@ 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;
>  
> @@ -284,7 +282,6 @@ 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;
>      }
> @@ -306,14 +303,13 @@ 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;
>  
> @@ -331,11 +327,12 @@ 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);
>  
>      qemu_aio_set_fd_handler(client->sock, NULL, NULL, NULL);
> 

Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>