From bc10916e890948d8927a5c8c40fb5dc44be5e1b8 Mon Sep 17 00:00:00 2001 From: Denis Efremov Date: Wed, 18 May 2022 11:00:52 +0400 Subject: staging: r8188eu: prevent ->Ssid overflow in rtw_wx_set_scan() This code has a check to prevent read overflow but it needs another check to prevent writing beyond the end of the ->Ssid[] array. Fixes: 2b42bd58b321 ("staging: r8188eu: introduce new os_dep dir for RTL8188eu driver") Cc: stable Signed-off-by: Denis Efremov Link: https://lore.kernel.org/r/20220518070052.108287-1-denis.e.efremov@oracle.com Signed-off-by: Greg Kroah-Hartman --- drivers/staging/r8188eu/os_dep/ioctl_linux.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) (limited to 'drivers/staging') diff --git a/drivers/staging/r8188eu/os_dep/ioctl_linux.c b/drivers/staging/r8188eu/os_dep/ioctl_linux.c index a802c1e7b456..9c1f576e067a 100644 --- a/drivers/staging/r8188eu/os_dep/ioctl_linux.c +++ b/drivers/staging/r8188eu/os_dep/ioctl_linux.c @@ -1131,9 +1131,11 @@ static int rtw_wx_set_scan(struct net_device *dev, struct iw_request_info *a, break; } sec_len = *(pos++); len -= 1; - if (sec_len > 0 && sec_len <= len) { + if (sec_len > 0 && + sec_len <= len && + sec_len <= 32) { ssid[ssid_index].SsidLength = sec_len; - memcpy(ssid[ssid_index].Ssid, pos, ssid[ssid_index].SsidLength); + memcpy(ssid[ssid_index].Ssid, pos, sec_len); ssid_index++; } pos += sec_len; -- cgit v1.2.3-58-ga151