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[PATCH 3.18 18/32] staging: rtl8188eu: prevent an underflow in rtw_check_beacon_data()

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  [PATCH 3.18 18/32] staging: rtl8188eu: prevent an underflow in rtw_check_beacon_data() Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-06-19 17:40 +0200

#1669311 — [PATCH 3.18 18/32] staging: rtl8188eu: prevent an underflow in rtw_check_beacon_data()

3.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Dan Carpenter <dan.carpenter@oracle.com>

commit 784047eb2d3405a35087af70cba46170c5576b25 upstream.

The "len" could be as low as -14 so we should check for negatives.

Fixes: 9a7fe54ddc3a ("staging: r8188eu: Add source files for new driver - part 1")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/staging/rtl8188eu/core/rtw_ap.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/staging/rtl8188eu/core/rtw_ap.c
+++ b/drivers/staging/rtl8188eu/core/rtw_ap.c
@@ -873,7 +873,7 @@ int rtw_check_beacon_data(struct adapter
 		return _FAIL;
 
 
-	if (len > MAX_IE_SZ)
+	if (len < 0 || len > MAX_IE_SZ)
 		return _FAIL;
 
 	pbss_network->IELength = len;

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