1 files changed, 18 insertions, 0 deletions
diff --git a/system/qemu/qemu_pcnet.patch b/system/qemu/qemu_pcnet.patch
new file mode 100644
index 000000000000..5fc27c6069b0
--- /dev/null
+++ b/system/qemu/qemu_pcnet.patch
@@ -0,0 +1,18 @@
+index bdfd38f..68b9981 100644 (file)
+--- a/hw/net/pcnet.c
++++ b/hw/net/pcnet.c
+@@ -1241,6 +1241,14 @@ static void pcnet_transmit(PCNetState *s)
+         }
+ 
+         bcnt = 4096 - GET_FIELD(tmd.length, TMDL, BCNT);
++
++        /* if multi-tmd packet outsizes s->buffer then skip it silently.
++           Note: this is not what real hw does */
++        if (s->xmit_pos + bcnt > sizeof(s->buffer)) {
++            s->xmit_pos = -1;
++            goto txdone;
++        }
++
+         s->phys_mem_read(s->dma_opaque, PHYSADDR(s, tmd.tbadr),
+                          s->buffer + s->xmit_pos, bcnt, CSR_BSWP(s));
+         s->xmit_pos += bcnt;
+\ No newline at end of file