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wifi: cfg80211: wext: add extra SIOCSIWSCAN data check 

[ Upstream commit 6ef09cdc5ba0f93826c09d810c141a8d103a80fc ]

In 'cfg80211_wext_siwscan()', add extra check whether number of
channels passed via 'ioctl(sock, SIOCSIWSCAN, ...)' doesn't exceed
IW_MAX_FREQUENCIES and reject invalid request with -EINVAL otherwise.

Reported-by: syzbot+253cd2d2491df77c93ac@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=253cd2d2491df77c93ac
Signed-off-by: Dmitry Antipov <dmantipov@yandex.ru>
Link: https://msgid.link/20240531032010.451295-1-dmantipov@yandex.ru
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Dmitry Antipov 2024-05-31 06:20:10 +03:00 committed by Greg Kroah-Hartman
parent 4871dd2f71
commit fe9644efd8
1 changed files with 6 additions and 2 deletions
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8
net/wireless/scan.c
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@ -3178,10 +3178,14 @@ int cfg80211_wext_siwscan(struct net_device *dev,
wiphy = &rdev->wiphy;
/* Determine number of channels, needed to allocate creq */
if (wreq && wreq->num_channels)
if (wreq && wreq->num_channels) {
/* Passed from userspace so should be checked */
if (unlikely(wreq->num_channels > IW_MAX_FREQUENCIES))
return -EINVAL;
n_channels = wreq->num_channels;
else
} else {
n_channels = ieee80211_get_num_supported_channels(wiphy);
}
creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) +
n_channels * sizeof(void *),