Am 29.02.2012 07:35, schrieb Dan Carpenter:
> If "offset" is negative then we can get past this check:
> if (offset > CONTROL_BUFFER_SIZE)
> Or if we pick a very high "req_ie_len" then we can get around the check:
> if (offset + req_ie_len > CONTROL_BUFFER_SIZE)
>
> I made "resp_ie_len" and "req_ie_len" unsigned. I don't know if it was
> intentional that they were signed in the original.
>
> Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
>
> diff --git a/drivers/net/wireless/rndis_wlan.c b/drivers/net/wireless/rndis_wlan.c
> index a330c69..6d8a986 100644
> --- a/drivers/net/wireless/rndis_wlan.c
> +++ b/drivers/net/wireless/rndis_wlan.c
> @@ -2755,9 +2755,10 @@ static void rndis_wlan_do_link_up_work(struct usbnet *usbdev)
> struct rndis_wlan_private *priv = get_rndis_wlan_priv(usbdev);
> struct ndis_80211_assoc_info *info = NULL;
> u8 bssid[ETH_ALEN];
> - int resp_ie_len, req_ie_len;
> + unsigned int resp_ie_len, req_ie_len;
> + unsigned int offset;
> u8 *req_ie, *resp_ie;
> - int ret, offset;
> + int ret;
> bool roamed = false;
> bool match_bss;
>
> @@ -2785,6 +2786,8 @@ static void rndis_wlan_do_link_up_work(struct usbnet *usbdev)
> ret = get_association_info(usbdev, info, CONTROL_BUFFER_SIZE);
> if (!ret) {
> req_ie_len = le32_to_cpu(info->req_ie_length);
> + if (req_ie_len > CONTROL_BUFFER_SIZE)
> + req_ie_len = CONTROL_BUFFER_SIZE;
> if (req_ie_len > 0) {
> offset = le32_to_cpu(info->offset_req_ies);
>
> @@ -2799,6 +2802,8 @@ static void rndis_wlan_do_link_up_work(struct usbnet *usbdev)
> }
>
> resp_ie_len = le32_to_cpu(info->resp_ie_length);
> + if (resp_ie_len > CONTROL_BUFFER_SIZE)
> + resp_ie_len = CONTROL_BUFFER_SIZE;
> if (resp_ie_len > 0) {
> offset = le32_to_cpu(info->offset_resp_ies);
>
hi dan,
the check below "if (resp_ie_len > 0)" looks strange for an unsigned.
re,
wh
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