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-rw-r--r--hw/ne2000.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/hw/ne2000.c b/hw/ne2000.c
index 1625c55388..6d5aa56e17 100644
--- a/hw/ne2000.c
+++ b/hw/ne2000.c
@@ -224,7 +224,7 @@ static void ne2000_receive(void *opaque, const uint8_t *buf, int size)
{
NE2000State *s = opaque;
uint8_t *p;
- int total_len, next, avail, len, index, mcast_idx;
+ unsigned int total_len, next, avail, len, index, mcast_idx;
uint8_t buf1[60];
static const uint8_t broadcast_macaddr[6] =
{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
@@ -293,7 +293,10 @@ static void ne2000_receive(void *opaque, const uint8_t *buf, int size)
/* write packet data */
while (size > 0) {
- avail = s->stop - index;
+ if (index <= s->stop)
+ avail = s->stop - index;
+ else
+ avail = 0;
len = size;
if (len > avail)
len = avail;