File 0098-net-ignore-packet-size-greater-than.patch of Package qemu.20395

Overview Repositories Revisions Requests Users Attributes Meta

File 0098-net-ignore-packet-size-greater-than.patch of Package qemu.20395

From: Jason Wang <jasowang@redhat.com>
Date: Wed, 30 May 2018 13:16:36 +0800
Subject: net: ignore packet size greater than INT_MAX

There should not be a reason for passing a packet size greater than
INT_MAX. It's usually a hint of bug somewhere, so ignore packet size
greater than INT_MAX in qemu_deliver_packet_iov()

CC: qemu-stable@nongnu.org
Reported-by: Daniel Shapira <daniel@twistlock.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
(cherry picked from commit 1592a9947036d60dde5404204a5d45975133caf5)
[LD: BSC#1111013 CVE-2018-17963]
Signed-off-by: Larry Dewey <ldewey@suse.com>
---
 net/net.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/net/net.c b/net/net.c
index 0719358d03378b9def6137acc0b4..14cbb9e1ed0726e001cba5c7eba5 100644
--- a/net/net.c
+++ b/net/net.c
@@ -729,10 +729,15 @@ ssize_t qemu_deliver_packet_iov(NetClientState *sender,
                                 void *opaque)
 {
     NetClientState *nc = opaque;
+    size_t size = iov_size(iov, iovcnt);
     int ret;
 
+    if (size > INT_MAX) {
+        return size;
+    }
+
     if (nc->link_down) {
-        return iov_size(iov, iovcnt);
+        return size;
     }
 
     if (nc->receive_disabled) {

Places

File 0098-net-ignore-packet-size-greater-than.patch of Package qemu.20395

Places