git: e0751ae801b3 - main - ip_mroute: Avoid leaking uninitialized bytes to the routing daemon

The branch main has been updated by markj:

URL: https://cgit.FreeBSD.org/src/commit/?id=e0751ae801b3e29c6dd52905ef1d63d5cd643b0a

commit e0751ae801b3e29c6dd52905ef1d63d5cd643b0a
Author:     Mark Johnston <markj@FreeBSD.org>
AuthorDate: 2026-04-24 13:22:51 +0000
Commit:     Mark Johnston <markj@FreeBSD.org>
CommitDate: 2026-04-24 13:22:51 +0000

    ip_mroute: Avoid leaking uninitialized bytes to the routing daemon
    
    Reported by:    KMSAN
    MFC after:      1 week
---
 sys/netinet/ip_mroute.c | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/sys/netinet/ip_mroute.c b/sys/netinet/ip_mroute.c
index 359755b19e95..14bd458b74f3 100644
--- a/sys/netinet/ip_mroute.c
+++ b/sys/netinet/ip_mroute.c
@@ -2459,13 +2459,14 @@ pim_register_send_upcall(struct mfctable *mfct, struct ip *ip, struct vif *vifp,
 
 	/* Send message to routing daemon */
 	im = mtod(mb_first, struct igmpmsg *);
-	im->im_msgtype	= IGMPMSG_WHOLEPKT;
-	im->im_mbz		= 0;
-	im->im_vif		= vifp - mfct->viftable;
-	im->im_src		= ip->ip_src;
-	im->im_dst		= ip->ip_dst;
-
-	k_igmpsrc.sin_addr	= ip->ip_src;
+	memset(im, 0, sizeof(*im));
+	im->im_msgtype = IGMPMSG_WHOLEPKT;
+	im->im_mbz = 0;
+	im->im_vif = vifp - mfct->viftable;
+	im->im_src = ip->ip_src;
+	im->im_dst = ip->ip_dst;
+
+	k_igmpsrc.sin_addr = ip->ip_src;
 
 	MRTSTAT_INC(mrts_upcalls);