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net: pcnet: check rx/tx descriptor ring length 

The AMD PC-Net II emulator has set of control and status(CSR)
registers. Of these, CSR76 and CSR78 hold receive and transmit
descriptor ring length respectively. This ring length could range
from 1 to 65535. Setting ring length to zero leads to an infinite
loop in pcnet_rdra_addr() or pcnet_transmit(). Add check to avoid it.

Reported-by: Li Qiang <liqiang6-s@360.cn>
Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
Signed-off-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Prasad J Pandit 2016-09-30 00:27:33 +05:30 committed by Jason Wang
parent ede0cbeb78
commit 34e29ce754
1 changed files with 3 additions and 0 deletions
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3
hw/net/pcnet.c
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@ -1429,8 +1429,11 @@ static void pcnet_csr_writew(PCNetState *s, uint32_t rap, uint32_t new_value)
case 47: /* POLLINT */
case 72:
case 74:
break;
case 76: /* RCVRL */
case 78: /* XMTRL */
val = (val > 0) ? val : 512;
break;
case 112:
if (CSR_STOP(s) || CSR_SPND(s))
break;