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>
(cherry picked from commit b02ba9a0b55b762bd04743a22f3d9f9645005e79)
Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@oracle.com>