mbuf: Add debugging helpers for allocation

This adds a few helpers for debugging mbuf allocations when running in
debugging mode (lsan, valgrind, etc.)

- We do not want to cache allocations, so always set M_DOFREE to prevent
  us from putting any mbuf in it.
- We want to update the mbuf allocation owner on function call for more
  precise leak reporting.

Based on Jeremy Marchand's fuzzing work.

Signed-off-by: jeremy marchand <jeremy.marchand@etu.u-bordeaux.fr>
Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/src/ip6_icmp.c b/src/ip6_icmp.c
index 21b1407..738b40f 100644
--- a/src/ip6_icmp.c
+++ b/src/ip6_icmp.c
@@ -385,12 +385,12 @@ static void ndp_input(struct mbuf *m, Slirp *slirp, struct ip6 *ip,
  */
 void icmp6_input(struct mbuf *m)
 {
+    Slirp *slirp = m->slirp;
     /* NDP reads the ethernet header for gratuitous NDP */
-    g_assert(M_ROOMBEFORE(m) >= ETH_HLEN);
+    M_DUP_DEBUG(slirp, m, 1, ETH_HLEN);
 
     struct icmp6 *icmp;
     struct ip6 *ip = mtod(m, struct ip6 *);
-    Slirp *slirp = m->slirp;
     int hlen = sizeof(struct ip6);
 
     DEBUG_CALL("icmp6_input");