usb: gadget: f_hid: fix: Prevent accessing released memory

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commit aa65d11aa0 upstream.

When we unlock our spinlock to copy data to user we may get
disabled by USB host and free the whole list of completed out
requests including the one from which we are copying the data
to user memory.

To prevent from this let's remove our working element from
the list and place it back only if there is sth left when we
finish with it.

Fixes: 99c5150058 ("usb: gadget: hidg: register OUT INT endpoint for SET_REPORT")
Tested-by: David Lechner <david@lechnology.com>
Signed-off-by: Krzysztof Opasiak <k.opasiak@samsung.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
[bwh: Backported to 3.16: adjust filename, context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

...

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Krzysztof Opasiak 2017-01-19 18:55:28 +01:00 • committed by Ben Hutchings

parent 6ecc5f5c51

commit 4911f4c18c

1 changed files with 20 additions and 4 deletions

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drivers/usb/gadget/f_hid.c

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