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Commit 9f938618 authored by Dan Carpenter's avatar Dan Carpenter Committed by Greg Kroah-Hartman
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UPSTREAM: usb: gadget: rndis: prevent integer overflow in rndis_set_response() 



If "BufOffset" is very large the "BufOffset + 8" operation can have an
integer overflow.

Bug: 213172319
Cc: stable@kernel.org
Fixes: 38ea1eac7d88 ("usb: gadget: rndis: check size of RNDIS_MSG_SET command")
Signed-off-by: default avatarDan Carpenter <dan.carpenter@oracle.com>
Link: https://lore.kernel.org/r/20220301080424.GA17208@kili


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 65f3324f4b6fed78b8761c3b74615ecf0ffa81fa)
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@google.com>
Change-Id: I16c7c6c5a0a3a0102d1c6c9ddfca2a1ad1106880
parent 09809e2b

drivers/usb/gadget/function/rndis.c

+1 −0
Original line number Diff line number Diff line
@@ -640,6 +640,7 @@ static int rndis_set_response(struct rndis_params *params, 
	BufLength = le32_to_cpu(buf->InformationBufferLength);

	BufOffset = le32_to_cpu(buf->InformationBufferOffset);

	if ((BufLength > RNDIS_MAX_TOTAL_SIZE) ||

	    (BufOffset > RNDIS_MAX_TOTAL_SIZE) ||

	    (BufOffset + 8 >= RNDIS_MAX_TOTAL_SIZE))

		    return -EINVAL;