From 34e29ce754c02bb6b3bdd244fbb85033460feaff Mon Sep 17 00:00:00 2001 From: Prasad J Pandit Date: Fri, 30 Sep 2016 00:27:33 +0530 Subject: 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 Signed-off-by: Prasad J Pandit Signed-off-by: Jason Wang --- hw/net/pcnet.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'hw/net/pcnet.c') diff --git a/hw/net/pcnet.c b/hw/net/pcnet.c index 198a01f..3078de8 100644 --- a/hw/net/pcnet.c +++ b/hw/net/pcnet.c @@ -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; -- cgit v1.1