diff options
Diffstat (limited to 'freebsd/sys/netinet/in.c')
| -rw-r--r-- | freebsd/sys/netinet/in.c | 21 |
1 files changed, 15 insertions, 6 deletions
diff --git a/freebsd/sys/netinet/in.c b/freebsd/sys/netinet/in.c index db1ebda0..ae32c8d9 100644 --- a/freebsd/sys/netinet/in.c +++ b/freebsd/sys/netinet/in.c @@ -1382,15 +1382,13 @@ in_lltable_lookup(struct lltable *llt, u_int flags, const struct sockaddr *l3add IF_AFDATA_LOCK_ASSERT(llt->llt_ifp); KASSERT(l3addr->sa_family == AF_INET, ("sin_family %d", l3addr->sa_family)); - lle = in_lltable_find_dst(llt, sin->sin_addr); + KASSERT((flags & (LLE_UNLOCKED | LLE_EXCLUSIVE)) != + (LLE_UNLOCKED | LLE_EXCLUSIVE), + ("wrong lle request flags: %#x", flags)); + lle = in_lltable_find_dst(llt, sin->sin_addr); if (lle == NULL) return (NULL); - - KASSERT((flags & (LLE_UNLOCKED|LLE_EXCLUSIVE)) != - (LLE_UNLOCKED|LLE_EXCLUSIVE),("wrong lle request flags: 0x%X", - flags)); - if (flags & LLE_UNLOCKED) return (lle); @@ -1399,6 +1397,17 @@ in_lltable_lookup(struct lltable *llt, u_int flags, const struct sockaddr *l3add else LLE_RLOCK(lle); + /* + * If the afdata lock is not held, the LLE may have been unlinked while + * we were blocked on the LLE lock. Check for this case. + */ + if (__predict_false((lle->la_flags & LLE_LINKED) == 0)) { + if (flags & LLE_EXCLUSIVE) + LLE_WUNLOCK(lle); + else + LLE_RUNLOCK(lle); + return (NULL); + } return (lle); } |