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Subject[PATCH 5.4 03/34] staging: rtl8723bs: prevent ->Ssid overflow in rtw_wx_set_scan()
Date
From: "Denis Efremov (Oracle)" <efremov@linux.com>

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: 554c0a3abf21 ("staging: Add rtl8723bs sdio wifi driver")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Denis Efremov (Oracle) <efremov@linux.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/staging/rtl8723bs/os_dep/ioctl_linux.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)

--- a/drivers/staging/rtl8723bs/os_dep/ioctl_linux.c
+++ b/drivers/staging/rtl8723bs/os_dep/ioctl_linux.c
@@ -1351,9 +1351,11 @@ static int rtw_wx_set_scan(struct net_de

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);
/* DBG_871X("%s COMBO_SCAN with specific ssid:%s, %d\n", __func__ */
/* , ssid[ssid_index].Ssid, ssid[ssid_index].SsidLength); */
ssid_index++;

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