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| author | Lee Gibson <leegib@gmail.com> | 2021-02-26 14:51:57 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-03-17 16:07:22 +0100 |
| commit | b5247b6661a55fb3de9c73a7227e630b218b35b5 (patch) | |
| tree | 0baade6b345d9cb314ccd28203b8d5eebe040e8a | |
| parent | e6cd3f4569d47af6a80b7a1b4ce96128362efcd3 (diff) | |
| download | linux-stable-b5247b6661a55fb3de9c73a7227e630b218b35b5.tar.gz linux-stable-b5247b6661a55fb3de9c73a7227e630b218b35b5.tar.bz2 linux-stable-b5247b6661a55fb3de9c73a7227e630b218b35b5.zip | |
staging: rtl8192e: Fix possible buffer overflow in _rtl92e_wx_set_scan
commit 8687bf9ef9551bcf93897e33364d121667b1aadf upstream.
Function _rtl92e_wx_set_scan calls memcpy without checking the length.
A user could control that length and trigger a buffer overflow.
Fix by checking the length is within the maximum allowed size.
Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Lee Gibson <leegib@gmail.com>
Cc: stable <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20210226145157.424065-1-leegib@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/staging/rtl8192e/rtl8192e/rtl_wx.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/staging/rtl8192e/rtl8192e/rtl_wx.c b/drivers/staging/rtl8192e/rtl8192e/rtl_wx.c index 70df6a1485d6..6f0be1db6fb1 100644 --- a/drivers/staging/rtl8192e/rtl8192e/rtl_wx.c +++ b/drivers/staging/rtl8192e/rtl8192e/rtl_wx.c @@ -419,9 +419,10 @@ static int _rtl92e_wx_set_scan(struct net_device *dev, struct iw_scan_req *req = (struct iw_scan_req *)b; if (req->essid_len) { - ieee->current_network.ssid_len = req->essid_len; - memcpy(ieee->current_network.ssid, req->essid, - req->essid_len); + int len = min_t(int, req->essid_len, IW_ESSID_MAX_SIZE); + + ieee->current_network.ssid_len = len; + memcpy(ieee->current_network.ssid, req->essid, len); } } |