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net: imx: limit buffer descriptor count 

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 <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 2017-02-02 16:16:24 +05:30 committed by Jason Wang
parent a935cc3132
commit 81f17e0d43
1 changed files with 6 additions and 4 deletions
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10
hw/net/imx_fec.c
View File

@ -55,6 +55,8 @@
} \
} while (0)
#define IMX_MAX_DESC 1024
static const char *imx_default_reg_name(IMXFECState *s, uint32_t index)
{
static char tmp[20];
@ -402,12 +404,12 @@ static void imx_eth_update(IMXFECState *s)
static void imx_fec_do_tx(IMXFECState *s)
{
int frame_size = 0;
int frame_size = 0, descnt = 0;
uint8_t frame[ENET_MAX_FRAME_SIZE];
uint8_t *ptr = frame;
uint32_t addr = s->tx_descriptor;
while (1) {
while (descnt++ < IMX_MAX_DESC) {
IMXFECBufDesc bd;
int len;
@ -453,12 +455,12 @@ static void imx_fec_do_tx(IMXFECState *s)
static void imx_enet_do_tx(IMXFECState *s)
{
int frame_size = 0;
int frame_size = 0, descnt = 0;
uint8_t frame[ENET_MAX_FRAME_SIZE];
uint8_t *ptr = frame;
uint32_t addr = s->tx_descriptor;
while (1) {
while (descnt++ < IMX_MAX_DESC) {
IMXENETBufDesc bd;
int len;