From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:59692) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WsXqy-00016L-UD for qemu-devel@nongnu.org; Thu, 05 Jun 2014 09:37:20 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1WsXqr-00048Y-Ae for qemu-devel@nongnu.org; Thu, 05 Jun 2014 09:37:12 -0400 Received: from mx1.redhat.com ([209.132.183.28]:48802) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WsXqr-00048I-3K for qemu-devel@nongnu.org; Thu, 05 Jun 2014 09:37:05 -0400 From: Kevin Wolf Date: Thu, 5 Jun 2014 15:36:26 +0200 Message-Id: <1401975393-7255-15-git-send-email-kwolf@redhat.com> In-Reply-To: <1401975393-7255-1-git-send-email-kwolf@redhat.com> References: <1401975393-7255-1-git-send-email-kwolf@redhat.com> Subject: [Qemu-devel] [PATCH v4 14/21] raw-win32: Handle failure for potentially large allocations List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: kwolf@redhat.com, benoit.canet@irqsave.net, stefanha@redhat.com Some code in the block layer makes potentially huge allocations. Failure is not completely unexpected there, so avoid aborting qemu and handle out-of-memory situations gracefully. This patch addresses the allocations in the raw-win32 block driver. Signed-off-by: Kevin Wolf Reviewed-by: Stefan Hajnoczi --- block/win32-aio.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/block/win32-aio.c b/block/win32-aio.c index 5d1d199..b8320ce 100644 --- a/block/win32-aio.c +++ b/block/win32-aio.c @@ -138,7 +138,10 @@ BlockDriverAIOCB *win32_aio_submit(BlockDriverState *bs, waiocb->is_read = (type == QEMU_AIO_READ); if (qiov->niov > 1) { - waiocb->buf = qemu_blockalign(bs, qiov->size); + waiocb->buf = qemu_try_blockalign(bs, qiov->size); + if (waiocb->buf == NULL) { + goto out; + } if (type & QEMU_AIO_WRITE) { iov_to_buf(qiov->iov, qiov->niov, 0, waiocb->buf, qiov->size); } @@ -167,6 +170,7 @@ BlockDriverAIOCB *win32_aio_submit(BlockDriverState *bs, out_dec_count: aio->count--; +out: qemu_aio_release(waiocb); return NULL; } -- 1.8.3.1