From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:50761) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XFoAX-0005XH-9l for qemu-devel@nongnu.org; Fri, 08 Aug 2014 13:41:38 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1XFoAR-0007Dh-RM for qemu-devel@nongnu.org; Fri, 08 Aug 2014 13:41:33 -0400 Received: from mx1.redhat.com ([209.132.183.28]:20750) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XFoAR-0007Db-Ke for qemu-devel@nongnu.org; Fri, 08 Aug 2014 13:41:27 -0400 Received: from int-mx10.intmail.prod.int.phx2.redhat.com (int-mx10.intmail.prod.int.phx2.redhat.com [10.5.11.23]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id s78HfL1L021095 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK) for ; Fri, 8 Aug 2014 13:41:26 -0400 From: Kevin Wolf Date: Fri, 8 Aug 2014 19:39:57 +0200 Message-Id: <1407519603-6635-57-git-send-email-kwolf@redhat.com> In-Reply-To: <1407519603-6635-1-git-send-email-kwolf@redhat.com> References: <1407519603-6635-1-git-send-email-kwolf@redhat.com> Subject: [Qemu-devel] [PULL 56/62] vmdk: 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 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 vmdk block driver. Signed-off-by: Kevin Wolf Reviewed-by: Stefan Hajnoczi Reviewed-by: Benoit Canet --- block/vmdk.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/block/vmdk.c b/block/vmdk.c index 3700a11..01412a8 100644 --- a/block/vmdk.c +++ b/block/vmdk.c @@ -456,7 +456,11 @@ static int vmdk_init_tables(BlockDriverState *bs, VmdkExtent *extent, /* read the L1 table */ l1_size = extent->l1_size * sizeof(uint32_t); - extent->l1_table = g_malloc(l1_size); + extent->l1_table = g_try_malloc(l1_size); + if (l1_size && extent->l1_table == NULL) { + return -ENOMEM; + } + ret = bdrv_pread(extent->file, extent->l1_table_offset, extent->l1_table, @@ -472,7 +476,11 @@ static int vmdk_init_tables(BlockDriverState *bs, VmdkExtent *extent, } if (extent->l1_backup_table_offset) { - extent->l1_backup_table = g_malloc(l1_size); + extent->l1_backup_table = g_try_malloc(l1_size); + if (l1_size && extent->l1_backup_table == NULL) { + ret = -ENOMEM; + goto fail_l1; + } ret = bdrv_pread(extent->file, extent->l1_backup_table_offset, extent->l1_backup_table, -- 1.8.3.1