From: Anant Thazhemadam <anant.thazhemadam@xxxxxxxxx> 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@xxxxxxxxxxxxxxx Reported-by: syzbot+b1bb342d1d097516cbda@xxxxxxxxxxxxxxxxxxxxxxxxx Tested-by: syzbot+b1bb342d1d097516cbda@xxxxxxxxxxxxxxxxxxxxxxxxx Signed-off-by: Anant Thazhemadam <anant.thazhemadam@xxxxxxxxx> Link: https://lore.kernel.org/r/20201007035401.9522-1-anant.thazhemadam@xxxxxxxxx Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- net/wireless/nl80211.c | 3 +++ 1 file changed, 3 insertions(+) --- a/net/wireless/nl80211.c +++ b/net/wireless/nl80211.c @@ -3283,6 +3283,9 @@ static int nl80211_del_key(struct sk_buf 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]);
