diff options
| author | Pan Bian <bianpan2016@163.com> | 2018-11-29 18:25:19 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-12-05 15:37:17 +0100 |
| commit | 070fc4ce25c831193918880ab307549ff9285167 (patch) | |
| tree | ccaf83674256f8be63715e3406974b29285865e0 /drivers/net | |
| parent | d98de9d9b8427db4be1b91949cc633aab5f7e76a (diff) | |
mwifiex: fix potential NULL dereference and use after free
[ Upstream commit 1dcd9429212b98bea87fc6ec92fb50bf5953eb47 ]
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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/net')
| -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 67c334221077..c013c94fbf15 100644 --- a/drivers/net/wireless/marvell/mwifiex/scan.c +++ b/drivers/net/wireless/marvell/mwifiex/scan.c @@ -1901,15 +1901,17 @@ 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 { |