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Make sure that we do not accept packets shorter than a full ethernet

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header, or we would have a negative length passed to ether_input().
This commit is contained in:
luigi 2001-02-08 22:21:30 +00:00
parent 1138c13e28
commit d0c5714da1
1 changed files with 3 additions and 1 deletions
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4
sys/dev/ed/if_ed.c
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@ -2174,8 +2174,10 @@ ed_rint(sc)
* we have a length that will fit into one mbuf cluster or less;
* the upper layer protocols can then figure out the length from
* their own length field(s).
* But make sure that we have at least a full ethernet header
* or we would be unable to call ether_input() later.
*/
if ((len > sizeof(struct ed_ring)) &&
if ((len > sizeof(struct ed_ring) + ETHER_HDR_LEN) &&
(len <= MCLBYTES) &&
(packet_hdr.next_packet >= sc->rec_page_start) &&
(packet_hdr.next_packet < sc->rec_page_stop)) {