From: Szymon Heidrich szymon.heidrich@gmail.com
commit 75e5b4849b81e19e9efe1654b30d7f3151c33c2c upstream.
Stall the control endpoint in case provided index exceeds array size of MAX_CONFIG_INTERFACES or when the retrieved function pointer is null.
Signed-off-by: Szymon Heidrich szymon.heidrich@gmail.com Cc: stable@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/usb/gadget/composite.c | 3 +++ 1 file changed, 3 insertions(+)
--- a/drivers/usb/gadget/composite.c +++ b/drivers/usb/gadget/composite.c @@ -1944,6 +1944,9 @@ unknown: if (w_index != 0x5 || (w_value >> 8)) break; interface = w_value & 0xFF; + if (interface >= MAX_CONFIG_INTERFACES || + !os_desc_cfg->interface[interface]) + break; buf[6] = w_index; count = count_ext_prop(os_desc_cfg, interface);