| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.4 12/30] staging: rtl8188eu: prevent an underflow in rtw_check_beacon_data() | Date | Mon, 19 Jun 2017 23:20:46 +0800 |
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4.4-stable review patch. If anyone has any objections, please let me know.
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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 @@ -894,7 +894,7 @@ 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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