From 81a006d8a9c249d84511ec07e2a01f8c974bbdf3 Mon Sep 17 00:00:00 2001 From: gjb Date: Thu, 30 Jul 2015 17:06:28 +0000 Subject: [PATCH] MFS 286079: MFC r285999 (kp): pf: Always initialise pf_fragment.fr_flags When we allocate the struct pf_fragment in pf_fillup_fragment() we forgot to initialise the fr_flags field. As a result we sometimes mistakenly thought the fragment to not be a buffered fragment. This resulted in panics because we'd end up freeing the pf_fragment but not removing it from V_pf_fragqueue (believing it to be part of V_pf_cachequeue). The next time we iterated V_pf_fragqueue we'd use a freed object and panic. While here also fix a pf_fragment use after free in pf_normalize_ip(). pf_reassemble() frees the pf_fragment, so we can't use it any more. Approved by: re (glebius) Sponsored by: The FreeBSD Foundation git-svn-id: https://svn.freebsd.org/base/releng/10.2@286083 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f --- sys/netpfil/pf/pf_norm.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/sys/netpfil/pf/pf_norm.c b/sys/netpfil/pf/pf_norm.c index 1f7d10964..d56ad3cec 100644 --- a/sys/netpfil/pf/pf_norm.c +++ b/sys/netpfil/pf/pf_norm.c @@ -433,6 +433,7 @@ pf_fillup_fragment(struct pf_fragment_cmp *key, struct pf_frent *frent, } *(struct pf_fragment_cmp *)frag = *key; + frag->fr_flags = 0; frag->fr_timeout = time_second; frag->fr_maxlen = frent->fe_len; TAILQ_INIT(&frag->fr_queue); @@ -1298,9 +1299,6 @@ pf_normalize_ip(struct mbuf **m0, int dir, struct pfi_kif *kif, u_short *reason, } } #endif - if (frag != NULL && (frag->fr_flags & PFFRAG_DROP)) - goto drop; - h = mtod(m, struct ip *); } else { /* non-buffering fragment cache (drops or masks overlaps) */ -- 2.42.0