File CVE-2015-7512-qemut-net-pcnet-buffer-overflow-in-non-loopback-mode.patch of Package xen.openSUSE_Leap_42.3_Update
References: bsc#962360 CVE-2015-7512
Backends could provide a packet whose length is greater than buffer
size. Check for this and truncate the packet to avoid rx buffer
overflow in this case.
Cc: Prasad J Pandit <address@hidden>
Cc: address@hidden
Signed-off-by: Jason Wang <address@hidden>
---
hw/net/pcnet.c | 6 ++++++
1 file changed, 6 insertions(+)
Index: xen-4.6.0-testing/tools/qemu-xen-traditional-dir-remote/hw/pcnet.c
===================================================================
--- xen-4.6.0-testing.orig/tools/qemu-xen-traditional-dir-remote/hw/pcnet.c
+++ xen-4.6.0-testing/tools/qemu-xen-traditional-dir-remote/hw/pcnet.c
@@ -1133,6 +1133,12 @@ static void pcnet_receive(void *opaque,
int pktcount = 0;
if (!s->looptest) {
+ if (size > 4092) {
+#ifdef PCNET_DEBUG_RMD
+ fprintf(stderr, "pcnet: truncates rx packet.\n");
+#endif
+ size = 4092;
+ }
memcpy(src, buf, size);
/* no need to compute the CRC */
src[size] = 0;