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 <p...@fedoraproject.org>
Cc: qemu-sta...@nongnu.org
Reviewed-by: Michael S. Tsirkin <m...@redhat.com>
Signed-off-by: Jason Wang <jasow...@redhat.com>
---
hw/net/pcnet.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/hw/net/pcnet.c b/hw/net/pcnet.c
index 309c40b..1f4a3db 100644
--- a/hw/net/pcnet.c
+++ b/hw/net/pcnet.c
@@ -1064,6 +1064,12 @@ ssize_t pcnet_receive(NetClientState *nc, const uint8_t
*buf, size_t size_)
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;
--
2.5.0
