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From f5596dffdad4014342239c7d3ec85e637969d2de Mon Sep 17 00:00:00 2001
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From: Fam Zheng <famz@redhat.com>
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Date: Fri, 29 Jul 2016 07:54:22 +0200
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Subject: [PATCH] block/iscsi: avoid potential overflow of acb->task->cdb
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RH-Author: Fam Zheng <famz@redhat.com>
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Message-id: <1469778862-32607-1-git-send-email-famz@redhat.com>
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Patchwork-id: 71515
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O-Subject: [RHEL-7.2.z qemu-kvm PATCH] block/iscsi: avoid potential overflow of acb->task->cdb
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Bugzilla: 1358996
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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RH-Acked-by: Laszlo Ersek <lersek@redhat.com>
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RH-Acked-by: Laurent Vivier <lvivier@redhat.com>
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From: Peter Lieven <pl@kamp.de>
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at least in the path via virtio-blk the maximum size is not
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restricted.
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Cc: qemu-stable@nongnu.org
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Signed-off-by: Peter Lieven <pl@kamp.de>
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Message-Id: <1464080368-29584-1-git-send-email-pl@kamp.de>
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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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(cherry picked from commit a6b3167fa0e825aebb5a7cd8b437b6d41584a196)
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Conflicts:
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block/iscsi.c
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Upstream uses qemu_aio_unref, downstream uses qemu_aio_release.
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Also, context in conflict because downstream doesn't have 4bb17ab51
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(iscsi: Emulate commands in iscsi_aio_ioctl as iscsi_ioctl).
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Signed-off-by: Fam Zheng <famz@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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block/iscsi.c | 7 +++++++
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1 file changed, 7 insertions(+)
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diff --git a/block/iscsi.c b/block/iscsi.c
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index 92dc1dd..d472ee8 100644
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--- a/block/iscsi.c
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+++ b/block/iscsi.c
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@@ -698,6 +698,13 @@ static BlockDriverAIOCB *iscsi_aio_ioctl(BlockDriverState *bs,
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acb->buf = NULL;
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acb->ioh = buf;
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+ if (acb->ioh->cmd_len > SCSI_CDB_MAX_SIZE) {
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+ error_report("iSCSI: ioctl error CDB exceeds max size (%d > %d)",
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+ acb->ioh->cmd_len, SCSI_CDB_MAX_SIZE);
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+ qemu_aio_release(acb);
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+ return NULL;
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+ }
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+
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acb->task = malloc(sizeof(struct scsi_task));
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if (acb->task == NULL) {
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error_report("iSCSI: Failed to allocate task for scsi command. %s",
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--
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1.8.3.1
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