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usb: rndis_host: Secure rndis_query check against int overflow

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Variables off and len typed as uint32 in rndis_query function
are controlled by incoming RNDIS response message thus their
value may be manipulated. Setting off to a unexpectetly large
value will cause the sum with len and 8 to overflow and pass
the implemented validation step. Consequently the response
pointer will be referring to a location past the expected
buffer boundaries allowing information leakage e.g. via
RNDIS_OID_802_3_PERMANENT_ADDRESS OID.

Fixes: ddda086240 ("USB: rndis_host, various cleanups")
Signed-off-by: Szymon Heidrich <szymon.heidrich@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Szymon Heidrich
2023-01-03 10:17:09 +01:00
committed by David S. Miller
parent 7dc6183854
commit c7dd13805f
1 changed files with 2 additions and 1 deletions
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drivers/net/usb/rndis_host.c
+2 -1
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@@ -255,7 +255,8 @@ static int rndis_query(struct usbnet *dev, struct usb_interface *intf,
off = le32_to_cpu(u.get_c->offset);
len = le32_to_cpu(u.get_c->len);
if (unlikely((8 + off + len) > CONTROL_BUFFER_SIZE))
if (unlikely((off > CONTROL_BUFFER_SIZE - 8) ||
(len > CONTROL_BUFFER_SIZE - 8 - off)))
goto response_error;
if (*reply_len != -1 && len != *reply_len)