usb: gadget: f_fs: fix error handling

This patch add missing error check in ffs_func_bind() function, after
ffs_do_descs() function call for high speed descriptors. Without this
check it's possible that the module will try dereference incorrect
pointer.

[ [email protected] : removed trailing empty line ]

Acked-by: Michal Nazarewicz <[email protected]>
Signed-off-by: Robert Baldyga <[email protected]>
Signed-off-by: Felipe Balbi <[email protected]>

Author: Robert Baldyga

drivers/usb/gadget/f_fs.c

@@ -2264,6 +2264,8 @@ static int ffs_func_bind(struct usb_configuration *c,
 				   data->raw_descs + ret,
 				   (sizeof data->raw_descs) - ret,
 				   __ffs_func_bind_do_descs, func);
+		if (unlikely(ret < 0))
+			goto error;
 	}
 
 	/*