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[Qemu-devel] [PATCH] net: mcf: check receive buffer size register value

From: P J P
Subject: [Qemu-devel] [PATCH] net: mcf: check receive buffer size register value
Date: Tue, 29 Nov 2016 00:38:39 +0530

From: Prasad J Pandit <address@hidden>

ColdFire Fast Ethernet Controller uses a receive buffer size
register(EMRBR) to hold maximum size of all receive buffers.
It is set by a user before any operation. If it was set to be
zero, ColdFire emulator would go into an infinite loop while
receiving data in mcf_fec_receive. Add check to avoid it.

Reported-by: Wjjzhang <address@hidden>
Signed-off-by: Prasad J Pandit <address@hidden>
 hw/net/mcf_fec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/net/mcf_fec.c b/hw/net/mcf_fec.c
index 0ee8ad9..13631e0 100644
--- a/hw/net/mcf_fec.c
+++ b/hw/net/mcf_fec.c
@@ -392,7 +392,7 @@ static void mcf_fec_write(void *opaque, hwaddr addr,
         s->tx_descriptor = s->etdsr;
     case 0x188:
-        s->emrbr = value & 0x7f0;
+        s->emrbr = value > 0 ? value & 0x7F0 : 0x7F0;
         hw_error("mcf_fec_write Bad address 0x%x\n", (int)addr);

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