diff options
| author | Pan Bian <bianpan2016@163.com> | 2018-11-29 18:25:19 +0800 |
|---|---|---|
| committer | Kalle Valo <kvalo@codeaurora.org> | 2018-12-13 16:53:42 +0200 |
| commit | 1dcd9429212b98bea87fc6ec92fb50bf5953eb47 (patch) | |
| tree | 535b65cf3d29d0291cb2c53d90ac9cb3f846c0b5 /drivers | |
| parent | 074b145a05835e9f93a52323a4770b70b4b782fd (diff) | |
mwifiex: fix potential NULL dereference and use after free
There are two defects: (1) passing a NULL bss to
mwifiex_save_hidden_ssid_channels will result in NULL dereference,
(2) using bss after dropping the reference to it via cfg80211_put_bss.
To fix them, the patch moves the buggy code to the branch that bss is
not NULL and puts it before cfg80211_put_bss.
Signed-off-by: Pan Bian <bianpan2016@163.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/wireless/marvell/mwifiex/scan.c | 18 |
1 files changed, 10 insertions, 8 deletions
diff --git a/drivers/net/wireless/marvell/mwifiex/scan.c b/drivers/net/wireless/marvell/mwifiex/scan.c index 8e483b0bc3b1..935778ec9a1b 100644 --- a/drivers/net/wireless/marvell/mwifiex/scan.c +++ b/drivers/net/wireless/marvell/mwifiex/scan.c @@ -1882,15 +1882,17 @@ mwifiex_parse_single_response_buf(struct mwifiex_private *priv, u8 **bss_info, ETH_ALEN)) mwifiex_update_curr_bss_params(priv, bss); - cfg80211_put_bss(priv->wdev.wiphy, bss); - } - if ((chan->flags & IEEE80211_CHAN_RADAR) || - (chan->flags & IEEE80211_CHAN_NO_IR)) { - mwifiex_dbg(adapter, INFO, - "radar or passive channel %d\n", - channel); - mwifiex_save_hidden_ssid_channels(priv, bss); + if ((chan->flags & IEEE80211_CHAN_RADAR) || + (chan->flags & IEEE80211_CHAN_NO_IR)) { + mwifiex_dbg(adapter, INFO, + "radar or passive channel %d\n", + channel); + mwifiex_save_hidden_ssid_channels(priv, + bss); + } + + cfg80211_put_bss(priv->wdev.wiphy, bss); } } } else { |