Module Name: src
Committed By: maxv
Date: Fri May 15 06:34:34 UTC 2020
Modified Files:
src/sys/netinet: igmp.c
Log Message:
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.
Reported-by: syzbot+e49f7b8a8fec5a477...@syzkaller.appspotmail.com
To generate a diff of this commit:
cvs rdiff -u -r1.69 -r1.70 src/sys/netinet/igmp.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
