usb: gadget: f_ncm: Use atomic_t to track in-flight request

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commit 5b24c28cfe upstream.

Currently ncm->notify_req is used to flag when a request is in-flight.
ncm->notify_req is set to NULL and when a request completes it is
subsequently reset.

This is fundamentally buggy in that the unbind logic of the NCM driver will
unconditionally free ncm->notify_req leading to a NULL pointer dereference.

Fixes: 40d133d7f5 ("usb: gadget: f_ncm: convert to new function interface with backward compatibility")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Signed-off-by: Felipe Balbi <balbi@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Bryan O'Donoghue 2020-01-09 13:17:21 +00:00 • committed by Greg Kroah-Hartman

parent bf8c62b3c5

commit f340c51d24

1 changed files with 13 additions and 4 deletions

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drivers/usb/gadget/function/f_ncm.c

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