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usb: musb: host: fix potential NULL pointer dereference 

musb_start_urb() doesn't check the pass-in parameter if it is NULL.  But
in musb_bulk_nak_timeout() the parameter passed to musb_start_urb() is
returned from first_qh(), which could be NULL.

So wrap the musb_start_urb() call here with a if condition check to
avoid the potential NULL pointer dereference.

Fixes: f283862f3b ("usb: musb: NAK timeout scheme on bulk TX endpoint")
Cc: stable@vger.kernel.org # v3.7+
Signed-off-by: Bin Liu <b-liu@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Bin Liu 2018-04-30 11:20:53 -05:00 committed by Greg Kroah-Hartman
parent 328da89950
commit 2b63f1329d
1 changed files with 3 additions and 1 deletions
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4
drivers/usb/musb/musb_host.c
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@ -990,7 +990,9 @@ static void musb_bulk_nak_timeout(struct musb *musb, struct musb_hw_ep *ep,
/* set tx_reinit and schedule the next qh */
ep->tx_reinit = 1;
}
musb_start_urb(musb, is_in, next_qh);
if (next_qh)
musb_start_urb(musb, is_in, next_qh);
}
}