From: Prasad J Pandit <address@hidden>
i.MX Fast Ethernet Controller uses buffer descriptors to manage
data flow to/fro receive & transmit queues. While transmitting
packets, it could continue to read buffer descriptors if a buffer
descriptor has length of zero and has crafted values in bd.flags.
Set an upper limit to number of buffer descriptors.
Reported-by: Li Qiang <address@hidden>
Signed-off-by: Prasad J Pandit <address@hidden>
---
hw/net/imx_fec.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
Update per
-> https://lists.gnu.org/archive/html/qemu-devel/2016-09/msg05284.html
diff --git a/hw/net/imx_fec.c b/hw/net/imx_fec.c
index e60e338..547fa99 100644
--- a/hw/net/imx_fec.c
+++ b/hw/net/imx_fec.c
@@ -94,6 +94,8 @@ static const VMStateDescription vmstate_imx_fec = {
#define PHY_INT_PARFAULT (1 << 2)
#define PHY_INT_AUTONEG_PAGE (1 << 1)
+#define IMX_MAX_DESC 1024
+
static void imx_fec_update(IMXFECState *s);
/*
@@ -264,12 +266,12 @@ static void imx_fec_update(IMXFECState *s)
static void imx_fec_do_tx(IMXFECState *s)
{
- int frame_size = 0;
+ int frame_size = 0, descnt = 0;
uint8_t frame[FEC_MAX_FRAME_SIZE];
uint8_t *ptr = frame;
uint32_t addr = s->tx_descriptor;
- while (1) {
+ while (descnt++ < IMX_MAX_DESC) {
IMXFECBufDesc bd;
int len;