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Disallow writing raw IP packets shorter than the IP header.

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This commit is contained in:
Bill Fenner 1997-05-22 20:52:56 +00:00
parent 6bca557688
commit 911089957e
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=26008
1 changed files with 3 additions and 2 deletions
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5
sys/netinet/raw_ip.c
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@ -31,7 +31,7 @@
* SUCH DAMAGE.
*
* @(#)raw_ip.c 8.7 (Berkeley) 5/15/95
* $Id: raw_ip.c,v 1.44 1997/04/03 05:14:43 davidg Exp $
* $Id: raw_ip.c,v 1.45 1997/04/27 20:01:10 wollman Exp $
*/
#include <sys/param.h>
@ -203,7 +203,8 @@ rip_output(m, so, dst)
and don't allow packet length sizes that will crash */
if (((IP_VHL_HL(ip->ip_vhl) != (sizeof (*ip) >> 2))
&& inp->inp_options)
|| (ip->ip_len > m->m_pkthdr.len)) {
|| (ip->ip_len > m->m_pkthdr.len)
|| (ip->ip_len < (IP_VHL_HL(ip->ip_vhl) << 2))) {
m_freem(m);
return EINVAL;
}