From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:47089) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fDXV0-0003LB-CP for qemu-devel@nongnu.org; Tue, 01 May 2018 11:47:27 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fDXUz-0001UX-Ae for qemu-devel@nongnu.org; Tue, 01 May 2018 11:47:26 -0400 From: Eric Blake Date: Tue, 1 May 2018 10:46:53 -0500 Message-Id: <20180501154654.943782-1-eblake@redhat.com> Subject: [Qemu-devel] [PATCH] nbd/client: Fix error messages during NBD_INFO_BLOCK_SIZE List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: vsementsov@virtuozzo.com, qemu-stable@nongnu.org, Paolo Bonzini , "open list:Network Block Dev..." A missing space makes for poor error messages. Also, we missed diagnosing a server that sends a maximum block size less than the minimum. Fixes: 081dd1fe CC: qemu-stable@nongnu.org Signed-off-by: Eric Blake --- nbd/client.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/nbd/client.c b/nbd/client.c index 7f35b5c3232..7b3caa90ec2 100644 --- a/nbd/client.c +++ b/nbd/client.c @@ -436,7 +436,7 @@ static int nbd_opt_go(QIOChannel *ioc, const char *wantname, be32_to_cpus(&info->min_block); if (!is_power_of_2(info->min_block)) { error_setg(errp, "server minimum block size %" PRId32 - "is not a power of two", info->min_block); + " is not a power of two", info->min_block); nbd_send_opt_abort(ioc); return -1; } @@ -451,7 +451,7 @@ static int nbd_opt_go(QIOChannel *ioc, const char *wantname, if (!is_power_of_2(info->opt_block) || info->opt_block < info->min_block) { error_setg(errp, "server preferred block size %" PRId32 - "is not valid", info->opt_block); + " is not valid", info->opt_block); nbd_send_opt_abort(ioc); return -1; } @@ -462,6 +462,12 @@ static int nbd_opt_go(QIOChannel *ioc, const char *wantname, return -1; } be32_to_cpus(&info->max_block); + if (info->max_block < info->min_block) { + error_setg(errp, "server maximum block size %" PRId32 + " is not valid", info->max_block); + nbd_send_opt_abort(ioc); + return -1; + } trace_nbd_opt_go_info_block_size(info->min_block, info->opt_block, info->max_block); break; -- 2.14.3