d/freebsd-dev
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Convert UDP length to host byte order

Browse Source 
When getting the number of bytes to checksum make sure to convert the UDP
length to host byte order when the entire header is not in the first mbuf.

Reviewed by: jtl, tuexen, ae
Approved by: re (gjb), jtl (mentor)
Differential Revision:  https://reviews.freebsd.org/D17357
This commit is contained in:
Tom Jones 2018-10-05 12:51:30 +00:00
parent 19fa5a5066
commit b6e870116f
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=339195
1 changed files with 3 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
sys/netinet/ip_output.c
View File

@ -932,10 +932,11 @@ in_delayed_cksum(struct mbuf *m)
if (m->m_pkthdr.csum_flags & CSUM_UDP) {
/* if udp header is not in the first mbuf copy udplen */
if (offset + sizeof(struct udphdr) > m->m_len)
if (offset + sizeof(struct udphdr) > m->m_len) {
m_copydata(m, offset + offsetof(struct udphdr,
uh_ulen), sizeof(cklen), (caddr_t)&cklen);
else {
cklen = ntohs(cklen);
} else {
uh = (struct udphdr *)mtodo(m, offset);
cklen = ntohs(uh->uh_ulen);
}