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From 75e5b4849b81e19e9efe1654b30d7f3151c33c2c Mon Sep 17 00:00:00 2001
From: Szymon Heidrich <szymon.heidrich@gmail.com>
Date: Mon, 24 Jan 2022 12:14:00 +0100
Subject: [PATCH] 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: 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(+)
diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c
index 16f9e3423c9faa..9315313108c9d5 100644
--- a/drivers/usb/gadget/composite.c
+++ b/drivers/usb/gadget/composite.c
@@ -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);
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