4.9-stable review patch. If anyone has any objections, please let me know.
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From: Heinrich Schuchardt xypron.glpk@gmx.de
commit af6f8529098aeb0e56a68671b450cf74e7a64fcd upstream.
musb->endpoints[] has array size MUSB_C_NUM_EPS. We must check array bounds before accessing the array and not afterwards.
Signed-off-by: Heinrich Schuchardt xypron.glpk@gmx.de Signed-off-by: Bin Liu b-liu@ti.com Cc: stable stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/usb/musb/musb_gadget_ep0.c | 14 +++++++++----- 1 file changed, 9 insertions(+), 5 deletions(-)
--- a/drivers/usb/musb/musb_gadget_ep0.c +++ b/drivers/usb/musb/musb_gadget_ep0.c @@ -114,15 +114,19 @@ static int service_tx_status_request( }
is_in = epnum & USB_DIR_IN; - if (is_in) { - epnum &= 0x0f; + epnum &= 0x0f; + if (epnum >= MUSB_C_NUM_EPS) { + handled = -EINVAL; + break; + } + + if (is_in) ep = &musb->endpoints[epnum].ep_in; - } else { + else ep = &musb->endpoints[epnum].ep_out; - } regs = musb->endpoints[epnum].regs;
- if (epnum >= MUSB_C_NUM_EPS || !ep->desc) { + if (!ep->desc) { handled = -EINVAL; break; }