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usb: gadget: rndis: prevent integer overflow in rndis_set_response()

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commit 65f3324f4b upstream.

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

Cc: stable@kernel.org
Fixes: 38ea1eac7d ("usb: gadget: rndis: check size of RNDIS_MSG_SET command")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Link: https://lore.kernel.org/r/20220301080424.GA17208@kili
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dan Carpenter
2022-03-01 11:04:24 +03:00
committed by Greg Kroah-Hartman
parent c66fcd42e8
commit 8b3e4d26bc
1 changed files with 1 additions and 0 deletions
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drivers/usb/gadget/function/rndis.c
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@@ -645,6 +645,7 @@ 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;