pim6d: valgrind issue fixes

Problem Statement:
===================
Syscall param sendmsg(msg.msg_iov[0]) points to uninitialised byte(s)
at 0x4975157: sendmsg (sendmsg.c:28)
==2263111==    by 0x1413BE: pim_msg_send_frame (pim_pim.c:629)
==2263111==    by 0x1413BE: pim_msg_send (pim_pim.c:743)
==2263111==    by 0x1425DC: pim_register_send (pim_register.c:332)
==2263111==    by 0x1427EE: pim_null_register_send (pim_register.c:443)
==2263111==    by 0x14D228: pim_upstream_register_stop_timer (pim_upstream.c:1608)
==2263111==    by 0x48CE6DF: thread_call (thread.c:1693)
==2263111==    by 0x4899EFF: frr_run (libfrr.c:1068)
==2263111==    by 0x11D035: main (pim6_main.c:190)
==2263111==  Address 0x1ffeffdcb1 is on thread 1's stack
==2263111==  in frame #2, created by pim_register_send (pim_register.c:273)
==2263111==  Uninitialised value was created by a stack allocation
==2263111==    at 0x142690: pim_null_register_send (pim_register.c:389)

RCA:
====================
1. All members of struct pim_msg_header were not initiliased while sending
null register packet. Therefore when the pointers are assigned while
sending the msg via sendmsg, it complains the pointer points to
uninitialised byte.
2. struct ipv6_ph ph was also not initialised.

Fix:
====================
Initialised all the members using memset.

Signed-off-by: Mobashshera Rasool <mrasool@vmware.com>
(cherry picked from commit 1064818645339d09ecfd79c95d4ff2ac330b1147)

diff --git a/pimd/pim_register.c b/pimd/pim_register.c
index 1f69175829a429ceda4fcb8fe7b4245643cd9b32..01da699dbd172eb51d28a5eb78a3390d6a9738ac 100644 (file)
--- a/pimd/pim_register.c
+++ b/pimd/pim_register.c
@@ -416,11 +416,8 @@ void pim_null_register_send(struct pim_upstream *up)
        memset(buffer, 0, (sizeof(ip6_hdr) + sizeof(pim_msg_header)));
        memcpy(buffer, &ip6_hdr, sizeof(ip6_hdr));
 
-       pim_msg_header.ver = 0;
-       pim_msg_header.type = 0;
-       pim_msg_header.reserved = 0;
-
-       pim_msg_header.checksum = 0;
+       memset(&pim_msg_header, 0, sizeof(pim_msg_header));
+       memset(&ph, 0, sizeof(ph));
 
        ph.src = up->sg.src;
        ph.dst = up->sg.grp;