File 0266-block-iscsi-avoid-potential-overflo.patch of Package qemu.4227

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File 0266-block-iscsi-avoid-potential-overflo.patch of Package qemu.4227

From 9a560b94500297a9ed9cdcf0743a4b4a909934b2 Mon Sep 17 00:00:00 2001
From: Peter Lieven <pl@kamp.de>
Date: Tue, 24 May 2016 10:59:28 +0200
Subject: [PATCH] block/iscsi: avoid potential overflow of acb->task->cdb

at least in the path via virtio-blk the maximum size is not
restricted.

Cc: qemu-stable@nongnu.org
Signed-off-by: Peter Lieven <pl@kamp.de>
Message-Id: <1464080368-29584-1-git-send-email-pl@kamp.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
(cherry picked from commit a6b3167fa0e825aebb5a7cd8b437b6d41584a196)
[BR: CVE-2016-5126 BSC#982285]
Signed-off-by: Bruce Rogers <brogers@suse.com>

Conflicts:
	block/iscsi.c
---
 block/iscsi.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/block/iscsi.c b/block/iscsi.c
index f425573df8..be15f4afe0 100644
--- a/block/iscsi.c
+++ b/block/iscsi.c
@@ -512,6 +512,13 @@ static BlockDriverAIOCB *iscsi_aio_ioctl(BlockDriverState *bs,
     acb->buf         = NULL;
     acb->ioh         = buf;
 
+    if (acb->ioh->cmd_len > SCSI_CDB_MAX_SIZE) {
+        error_report("iSCSI: ioctl error CDB exceeds max size (%d > %d)",
+                     acb->ioh->cmd_len, SCSI_CDB_MAX_SIZE);
+        qemu_aio_unref(acb);
+        return NULL;
+    }
+
     acb->task = malloc(sizeof(struct scsi_task));
     if (acb->task == NULL) {
         error_report("iSCSI: Failed to allocate task for scsi command. %s",

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File 0266-block-iscsi-avoid-potential-overflo.patch of Package qemu.4227

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