From: Prasad J Pandit <p...@fedoraproject.org>
In loopback mode, pcnet_receive routine appends CRC code to the
receive buffer. If the data size given is same as the buffer size,
the appended CRC code overwrites 4 bytes after s->buffer. Added a
check to avoid that.
Reported by: Qinghao Tang <luodalon...@gmail.com>
Cc: qemu-sta...@nongnu.org
Signed-off-by: Prasad J Pandit <p...@fedoraproject.org>
Signed-off-by: Jason Wang <jasow...@redhat.com>
---
hw/net/pcnet.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/hw/net/pcnet.c b/hw/net/pcnet.c
index 0eb3cc4..309c40b 100644
--- a/hw/net/pcnet.c
+++ b/hw/net/pcnet.c
@@ -1084,7 +1084,7 @@ ssize_t pcnet_receive(NetClientState *nc, const uint8_t
*buf, size_t size_)
uint32_t fcs = ~0;
uint8_t *p = src;
- while (p != &src[size-4])
+ while (p != &src[size])
CRC(fcs, *p++);
crc_err = (*(uint32_t *)p != htonl(fcs));
}
@@ -1233,8 +1233,10 @@ 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)) {
+ * Note: this is not what real hw does.
+ * Last four bytes of s->buffer are used to store CRC FCS code.
+ */
+ if (s->xmit_pos + bcnt > sizeof(s->buffer) - 4) {
s->xmit_pos = -1;
goto txdone;
}
--
2.5.0
