Re: [PATCH v2] usb: fix regression in SuperSpeed endpoint descriptor parsing

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Hello.

On 3/29/2016 1:47 PM, Mathias Nyman wrote:

commit b37d83a6a414 ("usb: Parse the new USB 3.1 SuperSpeedPlus Isoc
endpoint companion descriptor") caused a regression in 4.6-rc1 and fails
to parse SuperSpeed endpoint companion descriptors.

The new SuperSpeedPlus Isoc endpoint companion parsing code incorrectly
decreased the the remaining buffer size before comparing the size with the
expected length of the descriptor.

This lead to possible failure in reading the SuperSpeed endpoint companion
descriptor of the last endpoint, displaying a message like:

"No SuperSpeed endpoint companion for config 1 interface 0 altsetting 0
  ep 129: using minimum values"

Fix it by decreasing the size after comparing it.
Also finish all the SS endpoint companion parsing before calling SSP isoc
endpoint parsing function.

   Isn't it another problem?

Fixes: b37d83a6a414

   This tag requires the same format as you used above.

Signed-off-by: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx>

[...]

MBR, Sergei

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