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staging: rtl8188eu: prevent ->ssid overflow in rtw_wx_set_scan()

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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: a2c60d42d9 ("staging: r8188eu: Add files for new driver - part 16")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Cc: stable <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/YEHymwsnHewzoam7@mwanda
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dan Carpenter
2021-03-05 11:58:03 +03:00
committed by Greg Kroah-Hartman
parent d4ac640322
commit 74b6b20df8
1 changed files with 4 additions and 2 deletions
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6
drivers/staging/rtl8188eu/os_dep/ioctl_linux.c
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@@ -1133,9 +1133,11 @@ static int rtw_wx_set_scan(struct net_device *dev, struct iw_request_info *a,
break; break;
} }
sec_len = *(pos++); len -= 1; 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].ssid_length = sec_len; ssid[ssid_index].ssid_length = sec_len;
memcpy(ssid[ssid_index].ssid, pos, ssid[ssid_index].ssid_length); memcpy(ssid[ssid_index].ssid, pos, sec_len);
ssid_index++; ssid_index++;
} }
pos += sec_len; pos += sec_len;