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

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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 7e57714cd0
commit 65f3324f4b
1 changed files with 1 additions and 0 deletions
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drivers/usb/gadget/function/rndis.c
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@ -640,6 +640,7 @@ static int rndis_set_response(struct rndis_params *params,
BufLength = le32_to_cpu(buf->InformationBufferLength); BufLength = le32_to_cpu(buf->InformationBufferLength);
BufOffset = le32_to_cpu(buf->InformationBufferOffset); BufOffset = le32_to_cpu(buf->InformationBufferOffset);
if ((BufLength > RNDIS_MAX_TOTAL_SIZE) || if ((BufLength > RNDIS_MAX_TOTAL_SIZE) ||
(BufOffset > RNDIS_MAX_TOTAL_SIZE) ||
(BufOffset + 8 >= RNDIS_MAX_TOTAL_SIZE)) (BufOffset + 8 >= RNDIS_MAX_TOTAL_SIZE))
return -EINVAL; return -EINVAL;