mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-31 00:17:44 +00:00
bfd08d06d9
Inadvertently the commitb1cd1b65af
("USB: gadget: u_f: add overflow checks to VLA macros") makes VLA macros to always return 0 due to different scope of two variables of the same name. Obviously we need to have only one. Fixes:b1cd1b65af
("USB: gadget: u_f: add overflow checks to VLA macros") Reported-by: Marek Szyprowski <m.szyprowski@samsung.com> Tested-by: Marek Szyprowski <m.szyprowski@samsung.com> Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Cc: Brooke Basile <brookebasile@gmail.com> Cc: stable <stable@kernel.org> Link: https://lore.kernel.org/r/20200826192119.56450-1-andriy.shevchenko@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
86 lines
2.6 KiB
C
86 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* u_f.h
|
|
*
|
|
* Utility definitions for USB functions
|
|
*
|
|
* Copyright (c) 2013 Samsung Electronics Co., Ltd.
|
|
* http://www.samsung.com
|
|
*
|
|
* Author: Andrzej Pietrasiewicz <andrzejtp2010@gmail.com>
|
|
*/
|
|
|
|
#ifndef __U_F_H__
|
|
#define __U_F_H__
|
|
|
|
#include <linux/usb/gadget.h>
|
|
#include <linux/overflow.h>
|
|
|
|
/* Variable Length Array Macros **********************************************/
|
|
#define vla_group(groupname) size_t groupname##__next = 0
|
|
#define vla_group_size(groupname) groupname##__next
|
|
|
|
#define vla_item(groupname, type, name, n) \
|
|
size_t groupname##_##name##__offset = ({ \
|
|
size_t offset = 0; \
|
|
if (groupname##__next != SIZE_MAX) { \
|
|
size_t align_mask = __alignof__(type) - 1; \
|
|
size_t size = array_size(n, sizeof(type)); \
|
|
offset = (groupname##__next + align_mask) & \
|
|
~align_mask; \
|
|
if (check_add_overflow(offset, size, \
|
|
&groupname##__next)) { \
|
|
groupname##__next = SIZE_MAX; \
|
|
offset = 0; \
|
|
} \
|
|
} \
|
|
offset; \
|
|
})
|
|
|
|
#define vla_item_with_sz(groupname, type, name, n) \
|
|
size_t groupname##_##name##__sz = array_size(n, sizeof(type)); \
|
|
size_t groupname##_##name##__offset = ({ \
|
|
size_t offset = 0; \
|
|
if (groupname##__next != SIZE_MAX) { \
|
|
size_t align_mask = __alignof__(type) - 1; \
|
|
offset = (groupname##__next + align_mask) & \
|
|
~align_mask; \
|
|
if (check_add_overflow(offset, groupname##_##name##__sz,\
|
|
&groupname##__next)) { \
|
|
groupname##__next = SIZE_MAX; \
|
|
offset = 0; \
|
|
} \
|
|
} \
|
|
offset; \
|
|
})
|
|
|
|
#define vla_ptr(ptr, groupname, name) \
|
|
((void *) ((char *)ptr + groupname##_##name##__offset))
|
|
|
|
struct usb_ep;
|
|
struct usb_request;
|
|
|
|
/**
|
|
* alloc_ep_req - returns a usb_request allocated by the gadget driver and
|
|
* allocates the request's buffer.
|
|
*
|
|
* @ep: the endpoint to allocate a usb_request
|
|
* @len: usb_requests's buffer suggested size
|
|
*
|
|
* In case @ep direction is OUT, the @len will be aligned to ep's
|
|
* wMaxPacketSize. In order to avoid memory leaks or drops, *always* use
|
|
* usb_requests's length (req->length) to refer to the allocated buffer size.
|
|
* Requests allocated via alloc_ep_req() *must* be freed by free_ep_req().
|
|
*/
|
|
struct usb_request *alloc_ep_req(struct usb_ep *ep, size_t len);
|
|
|
|
/* Frees a usb_request previously allocated by alloc_ep_req() */
|
|
static inline void free_ep_req(struct usb_ep *ep, struct usb_request *req)
|
|
{
|
|
WARN_ON(req->buf == NULL);
|
|
kfree(req->buf);
|
|
req->buf = NULL;
|
|
usb_ep_free_request(ep, req);
|
|
}
|
|
|
|
#endif /* __U_F_H__ */
|