diff options
| author | Florian Westphal <fw@strlen.de> | 2019-05-05 18:47:33 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-01-27 14:50:47 +0100 |
| commit | 909021aed81180c68337ea1963b119af50efb284 (patch) | |
| tree | 36af7d8cc1d0540df9241320146f91f77be2a1fb /net/bridge | |
| parent | d4731bef53ba62ea55863cf7f2ebfd94e01b9c0c (diff) | |
netfilter: ebtables: CONFIG_COMPAT: reject trailing data after last rule
[ Upstream commit 680f6af5337c98d116e4f127cea7845339dba8da ]
If userspace provides a rule blob with trailing data after last target,
we trigger a splat, then convert ruleset to 64bit format (with trailing
data), then pass that to do_replace_finish() which then returns -EINVAL.
Erroring out right away avoids the splat plus unneeded translation and
error unwind.
Fixes: 81e675c227ec ("netfilter: ebtables: add CONFIG_COMPAT support")
Reported-by: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'net/bridge')
| -rw-r--r-- | net/bridge/netfilter/ebtables.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/net/bridge/netfilter/ebtables.c b/net/bridge/netfilter/ebtables.c index 785e19afd6aa..f59230e4fc29 100644 --- a/net/bridge/netfilter/ebtables.c +++ b/net/bridge/netfilter/ebtables.c @@ -2165,7 +2165,9 @@ static int compat_copy_entries(unsigned char *data, unsigned int size_user, if (ret < 0) return ret; - WARN_ON(size_remaining); + if (size_remaining) + return -EINVAL; + return state->buf_kern_offset; } |