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qmi_wwan: Fix qmap header retrieval in qmimux_rx_fixup

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This patch fixes qmap header retrieval when modem is configured for
dl data aggregation.

Signed-off-by: Daniele Palmas <dnlplm@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Daniele Palmas 2018-12-21 13:07:23 +01:00 committed by David S. Miller
parent 7c3db4105c
commit d667044f49
1 changed files with 8 additions and 7 deletions
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15
drivers/net/usb/qmi_wwan.c
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@ -151,17 +151,18 @@ static bool qmimux_has_slaves(struct usbnet *dev)
static int qmimux_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
{
unsigned int len, offset = sizeof(struct qmimux_hdr);
unsigned int len, offset = 0;
struct qmimux_hdr *hdr;
struct net_device *net;
struct sk_buff *skbn;
u8 qmimux_hdr_sz = sizeof(*hdr);
while (offset < skb->len) {
hdr = (struct qmimux_hdr *)skb->data;
while (offset + qmimux_hdr_sz < skb->len) {
hdr = (struct qmimux_hdr *)(skb->data + offset);
len = be16_to_cpu(hdr->pkt_len);
/* drop the packet, bogus length */
if (offset + len > skb->len)
if (offset + len + qmimux_hdr_sz > skb->len)
return 0;
/* control packet, we do not know what to do */
@ -176,7 +177,7 @@ static int qmimux_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
return 0;
skbn->dev = net;
switch (skb->data[offset] & 0xf0) {
switch (skb->data[offset + qmimux_hdr_sz] & 0xf0) {
case 0x40:
skbn->protocol = htons(ETH_P_IP);
break;
@ -188,12 +189,12 @@ static int qmimux_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
goto skip;
}
skb_put_data(skbn, skb->data + offset, len);
skb_put_data(skbn, skb->data + offset + qmimux_hdr_sz, len);
if (netif_rx(skbn) != NET_RX_SUCCESS)
return 0;
skip:
offset += len + sizeof(struct qmimux_hdr);
offset += len + qmimux_hdr_sz;
}
return 1;
}