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rndis_wlan: potential buffer overflow in rndis_wlan_auth_indication()

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This is a static checker fix, not something I have tested.  The issue
is that on the second iteration through the loop, we jump forward by
le32_to_cpu(auth_req->length) bytes.  The problem is that if the length
is more than "buflen" then we end up with a negative "buflen".  A
negative buflen is type promoted to a high positive value and the loop
continues but it's accessing beyond the end of the buffer.

I believe the "auth_req->length" comes from the firmware and if the
firmware is malicious or buggy, you're already toasted so the impact of
this bug is probably not very severe.

Fixes: 030645aceb ("rndis_wlan: handle 802.11 indications from device")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
This commit is contained in:
Dan Carpenter 2018-06-05 14:31:39 +03:00 committed by Kalle Valo
parent 8668f9a57c
commit ae636fb155
1 changed files with 2 additions and 0 deletions
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2
drivers/net/wireless/rndis_wlan.c
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@ -2928,6 +2928,8 @@ static void rndis_wlan_auth_indication(struct usbnet *usbdev,
while (buflen >= sizeof(*auth_req)) {
auth_req = (void *)buf;
if (buflen < le32_to_cpu(auth_req->length))
return;
type = "unknown";
flags = le32_to_cpu(auth_req->flags);
pairwise_error = false;