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From 3a56af1fbc17ff453f6e90fb08ce0c0e6fd0b61b Mon Sep 17 00:00:00 2001
From: P J P <pjp@fedoraproject.org>
Date: Fri, 4 Sep 2015 17:21:06 +0100
Subject: [PATCH] e1000: Avoid infinite loop in processing transmit descriptor (CVE-2015-6815)
While processing transmit descriptors, it could lead to an infinite
loop if 'bytes' was to become zero; Add a check to avoid it.
[The guest can force 'bytes' to 0 by setting the hdr_len and mss
descriptor fields to 0.
--Stefan]
Signed-off-by: P J P <pjp@fedoraproject.org>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-id: 1441383666-6590-1-git-send-email-stefanha@redhat.com
(cherry picked from commit b947ac2bf26479e710489739c465c8af336599e7)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
---
hw/net/e1000.c | 3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)
diff --git a/hw/net/e1000.c b/hw/net/e1000.c
index 5c6bcd0..09c9e9d 100644
--- a/hw/net/e1000.c
+++ b/hw/net/e1000.c
@@ -740,7 +740,8 @@ process_tx_desc(E1000State *s, struct e1000_tx_desc *dp)
memmove(tp->data, tp->header, tp->hdr_len);
tp->size = tp->hdr_len;
}
- } while (split_size -= bytes);
+ split_size -= bytes;
+ } while (bytes && split_size);
} else if (!tp->tse && tp->cptse) {
// context descriptor TSE is not set, while data descriptor TSE is set
DBGOUT(TXERR, "TCP segmentation error\n");
--
1.7.0.4
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