From: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
commit 65f3324f4b6fed78b8761c3b74615ecf0ffa81fa upstream.
If "BufOffset" is very large the "BufOffset + 8" operation can have an
integer overflow.
Cc: stable@xxxxxxxxxx
Fixes: 38ea1eac7d88 ("usb: gadget: rndis: check size of RNDIS_MSG_SET command")
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20220301080424.GA17208@kili
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/gadget/function/rndis.c | 1 +
1 file changed, 1 insertion(+)
--- a/drivers/usb/gadget/function/rndis.c
+++ b/drivers/usb/gadget/function/rndis.c
@@ -643,6 +643,7 @@ static int rndis_set_response(struct rnd
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;
