CVS commit: [netbsd-9] src/sys/netinet

["Martin Husemann" <martin%netbsd.org@localhost>]

Module Name:    src
Committed By:   martin
Date:           Mon May 18 18:59:40 UTC 2020

Modified Files:
        src/sys/netinet [netbsd-9]: igmp.c

Log Message:
Pull up following revision(s) (requested by maxv in ticket #915):

        sys/netinet/igmp.c: revision 1.70

igmp_sendpkt() expects ip_output() to set 'imo.imo_multicast_ttl' into
'ip->ip_ttl'; but ip_output() won't if the target is not a multicast
address, meaning that the uninitialized 'ip->ip_ttl' byte gets sent to
the network. This leaks one byte of kernel heap.

Fix this by filling 'ip->ip_ttl' with a TTL of one.

Found by KMSAN.


To generate a diff of this commit:
cvs rdiff -u -r1.69 -r1.69.4.1 src/sys/netinet/igmp.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.