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| author | Anant Thazhemadam <anant.thazhemadam@gmail.com> | 2020-10-07 06:54:01 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-10-14 10:46:22 +0300 |
| commit | 785ef2d0c5490f8481f862b2ccc09362945aff35 (patch) | |
| tree | b8a5684af696aa1d0061ed738ce897a0a7171812 | |
| parent | 0e3e69e0a8bc516e37ee3b496779b60e660b5ea5 (diff) | |
| download | linux-785ef2d0c5490f8481f862b2ccc09362945aff35.tar.xz | |
net: wireless: nl80211: fix out-of-bounds access in nl80211_del_key()
commit 3dc289f8f139997f4e9d3cfccf8738f20d23e47b upstream.
In nl80211_parse_key(), key.idx is first initialized as -1.
If this value of key.idx remains unmodified and gets returned, and
nl80211_key_allowed() also returns 0, then rdev_del_key() gets called
with key.idx = -1.
This causes an out-of-bounds array access.
Handle this issue by checking if the value of key.idx after
nl80211_parse_key() is called and return -EINVAL if key.idx < 0.
Cc: stable@vger.kernel.org
Reported-by: syzbot+b1bb342d1d097516cbda@syzkaller.appspotmail.com
Tested-by: syzbot+b1bb342d1d097516cbda@syzkaller.appspotmail.com
Signed-off-by: Anant Thazhemadam <anant.thazhemadam@gmail.com>
Link: https://lore.kernel.org/r/20201007035401.9522-1-anant.thazhemadam@gmail.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -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 55de35c4434a..95366e35ab13 100644 --- a/net/wireless/nl80211.c +++ b/net/wireless/nl80211.c @@ -3101,6 +3101,9 @@ static int nl80211_del_key(struct sk_buff *skb, struct genl_info *info) if (err) return err; + if (key.idx < 0) + return -EINVAL; + if (info->attrs[NL80211_ATTR_MAC]) mac_addr = nla_data(info->attrs[NL80211_ATTR_MAC]); |