usb: musb: Fix musb_gadget.c rxstate overflow bug
[ Upstream commit eea4c860c3
]
The usb function device call musb_gadget_queue() adds the passed
request to musb_ep::req_list,If the (request->length > musb_ep->packet_sz)
and (is_buffer_mapped(req) return false),the rxstate() will copy all data
in fifo to request->buf which may cause request->buf out of bounds.
Fix it by add the length check :
fifocnt = min_t(unsigned, request->length - request->actual, fifocnt);
Signed-off-by: Robin Guo <guoweibin@inspur.com>
Link: https://lore.kernel.org/r/20220906102119.1b071d07a8391ff115e6d1ef@inspur.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
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@ -760,6 +760,9 @@ static void rxstate(struct musb *musb, struct musb_request *req)
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musb_writew(epio, MUSB_RXCSR, csr);
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buffer_aint_mapped:
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fifo_count = min_t(unsigned int,
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request->length - request->actual,
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(unsigned int)fifo_count);
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musb_read_fifo(musb_ep->hw_ep, fifo_count, (u8 *)
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(request->buf + request->actual));
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request->actual += fifo_count;
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