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| author | Arnd Bergmann | 2016-11-08 14:28:19 +0100 |
|---|---|---|
| committer | Pablo Neira Ayuso | 2016-11-10 00:19:33 +0100 |
| commit | 56a62e2218f544258bd1796889a42f4516ccd04a (patch) | |
| tree | e333c98a7c95fff7d3f24be050f8202e6b0792f1 /net/netfilter/nf_conntrack_core.c | |
| parent | udp: provide udp{4,6}_lib_lookup for nf_socket_ipv{4,6} (diff) | |
| download | kernel-qcow2-linux-56a62e2218f544258bd1796889a42f4516ccd04a.tar.gz kernel-qcow2-linux-56a62e2218f544258bd1796889a42f4516ccd04a.tar.xz kernel-qcow2-linux-56a62e2218f544258bd1796889a42f4516ccd04a.zip | |
netfilter: conntrack: fix NF_REPEAT handling
gcc correctly identified a theoretical uninitialized variable use:
net/netfilter/nf_conntrack_core.c: In function 'nf_conntrack_in':
net/netfilter/nf_conntrack_core.c:1125:14: error: 'l4proto' may be used uninitialized in this function [-Werror=maybe-uninitialized]
This could only happen when we 'goto out' before looking up l4proto,
and then enter the retry, implying that l3proto->get_l4proto()
returned NF_REPEAT. This does not currently get returned in any
code path and probably won't ever happen, but is not good to
rely on.
Moving the repeat handling up a little should have the same
behavior as today but avoids the warning by making that case
impossible to enter.
[ I have mangled this original patch to remove the check for tmpl, we
should inconditionally jump back to the repeat label in case we hit
NF_REPEAT instead. I have also moved the comment that explains this
where it belongs. --pablo ]
Fixes: 08733a0cb7de ("netfilter: handle NF_REPEAT from nf_conntrack_in()")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net/netfilter/nf_conntrack_core.c')
| -rw-r--r-- | net/netfilter/nf_conntrack_core.c | 18 |
1 files changed, 8 insertions, 10 deletions
diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c index de4b8a75f30b..e9ffe33dc0ca 100644 --- a/net/netfilter/nf_conntrack_core.c +++ b/net/netfilter/nf_conntrack_core.c @@ -1337,6 +1337,12 @@ repeat: NF_CT_STAT_INC_ATOMIC(net, invalid); if (ret == -NF_DROP) NF_CT_STAT_INC_ATOMIC(net, drop); + /* Special case: TCP tracker reports an attempt to reopen a + * closed/aborted connection. We have to go back and create a + * fresh conntrack. + */ + if (ret == -NF_REPEAT) + goto repeat; ret = -ret; goto out; } @@ -1344,16 +1350,8 @@ repeat: if (set_reply && !test_and_set_bit(IPS_SEEN_REPLY_BIT, &ct->status)) nf_conntrack_event_cache(IPCT_REPLY, ct); out: - if (tmpl) { - /* Special case: TCP tracker reports an attempt to reopen a - * closed/aborted connection. We have to go back and create a - * fresh conntrack. - */ - if (ret == NF_REPEAT) - goto repeat; - else - nf_ct_put(tmpl); - } + if (tmpl) + nf_ct_put(tmpl); return ret; } |