usb: gadget: ncm: Handle decoding of multiple NTB's in unwrap call

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commit 427694cfaa upstream.

When NCM is used with hosts like Windows PC, it is observed that there are
multiple NTB's contained in one usb request giveback. Since the driver
unwraps the obtained request data assuming only one NTB is present, we
loose the subsequent NTB's present resulting in data loss.

Fix this by checking the parsed block length with the obtained data
length in usb request and continue parsing after the last byte of current
NTB.

Cc: stable@vger.kernel.org
Fixes: 9f6ce4240a ("usb: gadget: f_ncm.c added")
Signed-off-by: Krishna Kurapati <quic_kriskura@quicinc.com>
Reviewed-by: Maciej Żenczykowski <maze@google.com>
Link: https://lore.kernel.org/r/20230927105858.12950-1-quic_kriskura@quicinc.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Krishna Kurapati 2023-09-27 16:28:58 +05:30 • committed by Greg Kroah-Hartman

parent e5588fb391

commit 49fbc18378

1 changed files with 19 additions and 7 deletions

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drivers/usb/gadget/function/f_ncm.c

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