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| author | Florian Westphal <fw@strlen.de> | 2011-08-30 15:01:20 +0200 |
|---|---|---|
| committer | Patrick McHardy <kaber@trash.net> | 2011-08-30 15:01:20 +0200 |
| commit | c6675233f9015d3c0460c8aab53ed9b99d915c64 (patch) | |
| tree | 3d1b9b71059be24fe3a35411eecc62000bba5abc /net/netfilter | |
| parent | 9823d9ff483af4ce8804a9eb69600ca739cd1f58 (diff) | |
| download | linux-c6675233f9015d3c0460c8aab53ed9b99d915c64.tar.bz2 | |
netfilter: nf_queue: reject NF_STOLEN verdicts from userspace
A userspace listener may send (bogus) NF_STOLEN verdict, which causes skb leak.
This problem was previously fixed via
64507fdbc29c3a622180378210ecea8659b14e40 (netfilter:
nf_queue: fix NF_STOLEN skb leak) but this had to be reverted because
NF_STOLEN can also be returned by a netfilter hook when iterating the
rules in nf_reinject.
Reject userspace NF_STOLEN verdict, as suggested by Michal Miroslaw.
This is complementary to commit fad54440438a7c231a6ae347738423cbabc936d9
(netfilter: avoid double free in nf_reinject).
Cc: Julian Anastasov <ja@ssi.bg>
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Diffstat (limited to 'net/netfilter')
| -rw-r--r-- | net/netfilter/nfnetlink_queue.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/net/netfilter/nfnetlink_queue.c b/net/netfilter/nfnetlink_queue.c index 00bd475eab4b..a80b0cb03f17 100644 --- a/net/netfilter/nfnetlink_queue.c +++ b/net/netfilter/nfnetlink_queue.c @@ -646,8 +646,8 @@ verdicthdr_get(const struct nlattr * const nfqa[]) return NULL; vhdr = nla_data(nfqa[NFQA_VERDICT_HDR]); - verdict = ntohl(vhdr->verdict); - if ((verdict & NF_VERDICT_MASK) > NF_MAX_VERDICT) + verdict = ntohl(vhdr->verdict) & NF_VERDICT_MASK; + if (verdict > NF_MAX_VERDICT || verdict == NF_STOLEN) return NULL; return vhdr; } |