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Add proper rangechecks in "axge_rx_frame()" function and

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fix receive loop header parsing.

MFC after:	3 days
PR:		191432
This commit is contained in:
hselasky 2014-06-27 10:24:36 +00:00
parent 689a02cb4f
commit 5491e63797
1 changed files with 21 additions and 12 deletions
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33
sys/dev/usb/net/if_axge.c
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@ -929,14 +929,19 @@ axge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
static int
axge_rx_frame(struct usb_ether *ue, struct usb_page_cache *pc, int actlen)
{
int error, pos;
int error;
int pos;
int pkt_cnt;
uint32_t rxhdr, pkt_hdr;
uint16_t hdr_off;
uint16_t len, pktlen;
uint32_t rxhdr;
uint32_t pkt_hdr;
uint32_t hdr_off;
uint32_t pktlen;
/* verify we have enough data */
if (actlen < (int)sizeof(rxhdr))
return (EINVAL);
pos = 0;
len = 0;
error = 0;
usbd_copy_out(pc, actlen - sizeof(rxhdr), &rxhdr, sizeof(rxhdr));
@ -945,25 +950,29 @@ axge_rx_frame(struct usb_ether *ue, struct usb_page_cache *pc, int actlen)
pkt_cnt = (uint16_t)rxhdr;
hdr_off = (uint16_t)(rxhdr >> 16);
usbd_copy_out(pc, hdr_off, &pkt_hdr, sizeof(pkt_hdr));
while (pkt_cnt > 0) {
if ((int)(sizeof(pkt_hdr)) > actlen) {
/* verify the header offset */
if ((int)(hdr_off + sizeof(pkt_hdr)) > actlen) {
error = EINVAL;
break;
}
usbd_copy_out(pc, hdr_off, &pkt_hdr, sizeof(pkt_hdr));
pkt_hdr = le32toh(pkt_hdr);
pktlen = (pkt_hdr >> 16) & 0x1fff;
if ((pkt_hdr & AXGE_RXHDR_CRC_ERR) ||
(pkt_hdr & AXGE_RXHDR_DROP_ERR))
ue->ue_ifp->if_ierrors++;
/* verify the data payload */
if (pktlen < 6 || (int)(pos + 2 + pktlen - 6) > actlen) {
error = EINVAL;
break;
}
axge_rxeof(ue, pc, pos + 2, pktlen - 6, pkt_hdr);
len = (pktlen + 7) & ~7;
pos += len;
pkt_hdr++;
pos += (pktlen + 7) & ~7;
hdr_off += sizeof(pkt_hdr);
pkt_cnt--;
}
if (error != 0)
ue->ue_ifp->if_ierrors++;
return (error);