File CVE-2018-17958-qemuu-rtl8139-integer-overflow-leads-to-buffer-overflow.patch of Package xen.11298

References: bsc#1111007 CVE-2018-17958

In rtl8139_do_receive(), we try to assign size_ to size which converts
from size_t to integer. This will cause troubles when size_ is greater
INT_MAX, this will lead a negative value in size and it can then pass
the check of size < MIN_BUF_SIZE which may lead out of bound access of
for both buf and buf1.

Fixing by converting the type of size to size_t.

CC: address@hidden
Reported-by: Daniel Shapira <address@hidden>
Reviewed-by: Michael S. Tsirkin <address@hidden>
Signed-off-by: Jason Wang <address@hidden>
---
 hw/net/rtl8139.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

Index: xen-4.5.5-testing/tools/qemu-xen-dir-remote/hw/net/rtl8139.c
===================================================================
--- xen-4.5.5-testing.orig/tools/qemu-xen-dir-remote/hw/net/rtl8139.c
+++ xen-4.5.5-testing/tools/qemu-xen-dir-remote/hw/net/rtl8139.c
@@ -822,7 +822,7 @@ static ssize_t rtl8139_do_receive(NetCli
     RTL8139State *s = qemu_get_nic_opaque(nc);
     PCIDevice *d = PCI_DEVICE(s);
     /* size is the length of the buffer passed to the driver */
-    int size = size_;
+    size_t size = size_;
     const uint8_t *dot1q_buf = NULL;
 
     uint32_t packet_header = 0;
@@ -831,7 +831,7 @@ static ssize_t rtl8139_do_receive(NetCli
     static const uint8_t broadcast_macaddr[6] =
         { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 
-    DPRINTF(">>> received len=%d\n", size);
+    DPRINTF(">>> received len=%zu\n", size);
 
     /* test if board clock is stopped */
     if (!s->clock_enabled)
@@ -1041,7 +1041,7 @@ static ssize_t rtl8139_do_receive(NetCli
 
         if (size+4 > rx_space)
         {
-            DPRINTF("C+ Rx mode : descriptor %d size %d received %d + 4\n",
+            DPRINTF("C+ Rx mode : descriptor %d size %d received %zu + 4\n",
                 descriptor, rx_space, size);
 
             s->IntrStatus |= RxOverflow;
@@ -1152,7 +1152,7 @@ static ssize_t rtl8139_do_receive(NetCli
         if (avail != 0 && size + 8 >= avail)
         {
             DPRINTF("rx overflow: rx buffer length %d head 0x%04x "
-                "read 0x%04x === available 0x%04x need 0x%04x\n",
+                "read 0x%04x === available 0x%04x need 0x%04zx\n",
                 s->RxBufferSize, s->RxBufAddr, s->RxBufPtr, avail, size + 8);
 
             s->IntrStatus |= RxOverflow;