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From 242abde4b0152142787bd3200de5cc35863da59a Mon Sep 17 00:00:00 2001
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From: jmaloy <jmaloy@redhat.com>
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Date: Wed, 29 Jan 2020 21:41:14 +0000
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Subject: [PATCH 1/6] iscsi: Avoid potential for get_status overflow
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: jmaloy <jmaloy@redhat.com>
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Message-id: <20200129214115.19979-2-jmaloy@redhat.com>
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Patchwork-id: 93587
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O-Subject: [RHEL-8.2.0 qemu-kvm PATCH 1/2] iscsi: Avoid potential for get_status overflow
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Bugzilla: 1794501
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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RH-Acked-by: Kevin Wolf <kwolf@redhat.com>
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RH-Acked-by: Philippe Mathieu-Daudé <philmd@redhat.com>
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From: Eric Blake <eblake@redhat.com>
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Detected by Coverity: Multiplying two 32-bit int and assigning
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the result to a 64-bit number is a risk of overflow. Prior to
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the conversion to byte-based interfaces, the block layer took
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care of ensuring that a status request never exceeded 2G in
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the driver; but after that conversion, the block layer expects
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drivers to deal with any size request (the driver can always
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truncate the request size back down, as long as it makes
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progress). So, in the off-chance that someone makes a large
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request, we are at the mercy of whether iscsi_get_lba_status_task()
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will cap things to at most INT_MAX / iscsilun->block_size when
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it populates lbasd->num_blocks; since I could not easily audit
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that, it's better to be safe than sorry by just forcing a 64-bit
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multiply.
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Fixes: 92809c36
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CC: qemu-stable@nongnu.org
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Signed-off-by: Eric Blake <eblake@redhat.com>
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Message-Id: <20180508212718.1482663-1-eblake@redhat.com>
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Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
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(cherry picked from commit 8ee1cef4593a7bda076891470c0620e79333c0d0)
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Signed-off-by: Jon Maloy <jmaloy@redhat.com>
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Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
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---
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block/iscsi.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/block/iscsi.c b/block/iscsi.c
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index c412b12..336ce49 100644
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--- a/block/iscsi.c
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+++ b/block/iscsi.c
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@@ -734,7 +734,7 @@ retry:
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goto out_unlock;
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}
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- *pnum = lbasd->num_blocks * iscsilun->block_size;
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+ *pnum = (int64_t) lbasd->num_blocks * iscsilun->block_size;
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if (lbasd->provisioning == SCSI_PROVISIONING_TYPE_DEALLOCATED ||
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lbasd->provisioning == SCSI_PROVISIONING_TYPE_ANCHORED) {
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--
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1.8.3.1
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