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| author | Vladis Dronov <vdronov@redhat.com> | 2017-09-13 00:21:21 +0200 |
|---|---|---|
| committer | Johannes Berg <johannes.berg@intel.com> | 2017-09-15 09:15:14 +0200 |
| commit | e785fa0a164aa11001cba931367c7f94ffaff888 (patch) | |
| tree | d64e0f5109be36bb948ceae6cea57b0851423293 /net | |
| parent | 126f760ca94dae77425695f9f9238b731de86e32 (diff) | |
| download | linux-exynos-e785fa0a164aa11001cba931367c7f94ffaff888.tar.gz linux-exynos-e785fa0a164aa11001cba931367c7f94ffaff888.tar.bz2 linux-exynos-e785fa0a164aa11001cba931367c7f94ffaff888.zip | |
nl80211: check for the required netlink attributes presence
nl80211_set_rekey_data() does not check if the required attributes
NL80211_REKEY_DATA_{REPLAY_CTR,KEK,KCK} are present when processing
NL80211_CMD_SET_REKEY_OFFLOAD request. This request can be issued by
users with CAP_NET_ADMIN privilege and may result in NULL dereference
and a system crash. Add a check for the required attributes presence.
This patch is based on the patch by bo Zhang.
This fixes CVE-2017-12153.
References: https://bugzilla.redhat.com/show_bug.cgi?id=1491046
Fixes: e5497d766ad ("cfg80211/nl80211: support GTK rekey offload")
Cc: <stable@vger.kernel.org> # v3.1-rc1
Reported-by: bo Zhang <zhangbo5891001@gmail.com>
Signed-off-by: Vladis Dronov <vdronov@redhat.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'net')
| -rw-r--r-- | net/wireless/nl80211.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c index 0df8023f480b..fbd5593e88cb 100644 --- a/net/wireless/nl80211.c +++ b/net/wireless/nl80211.c @@ -10903,6 +10903,9 @@ static int nl80211_set_rekey_data(struct sk_buff *skb, struct genl_info *info) if (err) return err; + if (!tb[NL80211_REKEY_DATA_REPLAY_CTR] || !tb[NL80211_REKEY_DATA_KEK] || + !tb[NL80211_REKEY_DATA_KCK]) + return -EINVAL; if (nla_len(tb[NL80211_REKEY_DATA_REPLAY_CTR]) != NL80211_REPLAY_CTR_LEN) return -ERANGE; if (nla_len(tb[NL80211_REKEY_DATA_KEK]) != NL80211_KEK_LEN) |