Commit 75e5b484 authored by Szymon Heidrich's avatar Szymon Heidrich Committed by Greg Kroah-Hartman
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USB: gadget: validate interface OS descriptor requests 



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: default avatarSzymon Heidrich <szymon.heidrich@gmail.com>
Cc: stable@kernel.org
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent c853685d

drivers/usb/gadget/composite.c

+3 −0
Original line number Diff line number Diff line
@@ -1988,6 +1988,9 @@ composite_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl) 
				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);