diff options
| author | Dmitry Antipov <dmantipov@yandex.ru> | 2024-05-31 06:20:10 +0300 |
|---|---|---|
| committer | Johannes Berg <johannes.berg@intel.com> | 2024-06-12 11:07:56 +0300 |
| commit | 6ef09cdc5ba0f93826c09d810c141a8d103a80fc (patch) | |
| tree | e6ad74984681cfe0decd275baf2937f7396ce59e /net | |
| parent | 0941772342d59e48733131ac3a202fa1a4d832e9 (diff) | |
| download | linux-6ef09cdc5ba0f93826c09d810c141a8d103a80fc.tar.xz | |
wifi: cfg80211: wext: add extra SIOCSIWSCAN data check
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>
Diffstat (limited to 'net')
| -rw-r--r-- | net/wireless/scan.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/net/wireless/scan.c b/net/wireless/scan.c index d7485e26f4fc..0222ede0feb6 100644 --- a/net/wireless/scan.c +++ b/net/wireless/scan.c @@ -3416,10 +3416,14 @@ 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 *), |