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| author | Debabrata Banerjee <dbanerje@akamai.com> | 2017-12-13 15:33:37 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-12-16 16:25:46 +0100 |
| commit | 0cab694ab7bca62eb42dbfae209c08edc8d229c4 (patch) | |
| tree | 01646943cccecf4c3ca48167da871276ddfa23ac /net | |
| parent | cf00fd3d526cdabaf558e911d71d0a2c303cf0e7 (diff) | |
| download | linux-stable-0cab694ab7bca62eb42dbfae209c08edc8d229c4.tar.gz linux-stable-0cab694ab7bca62eb42dbfae209c08edc8d229c4.tar.bz2 linux-stable-0cab694ab7bca62eb42dbfae209c08edc8d229c4.zip | |
Fix handling of verdicts after NF_QUEUE
[This fix is only needed for v4.9 stable since v4.10+ does not have the issue]
A verdict of NF_STOLEN after NF_QUEUE will cause an incorrect return value
and a potential kernel panic via double free of skb's
This was broken by commit 7034b566a4e7 ("netfilter: fix nf_queue handling")
and subsequently fixed in v4.10 by commit c63cbc460419 ("netfilter:
use switch() to handle verdict cases from nf_hook_slow()"). However that
commit cannot be cleanly cherry-picked to v4.9
Signed-off-by: Debabrata Banerjee <dbanerje@akamai.com>
Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net')
| -rw-r--r-- | net/netfilter/core.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/net/netfilter/core.c b/net/netfilter/core.c index 004af030ef1a..d869ea50623e 100644 --- a/net/netfilter/core.c +++ b/net/netfilter/core.c @@ -364,6 +364,11 @@ next_hook: ret = nf_queue(skb, state, &entry, verdict); if (ret == 1 && entry) goto next_hook; + } else { + /* Implicit handling for NF_STOLEN, as well as any other + * non conventional verdicts. + */ + ret = 0; } return ret; } |