1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * 32bit -> 64bit ioctl wrapper for hwdep API
4 * Copyright (c) by Takashi Iwai <tiwai@suse.de>
5 */
6
7 /* This file is included from hwdep.c */
8
9 #include <linux/compat.h>
10
11 struct snd_hwdep_dsp_image32 {
12 u32 index;
13 unsigned char name[64];
14 u32 image; /* pointer */
15 u32 length;
16 u32 driver_data;
17 } /* don't set packed attribute here */;
18
snd_hwdep_dsp_load_compat(struct snd_hwdep * hw,struct snd_hwdep_dsp_image32 __user * src)19 static int snd_hwdep_dsp_load_compat(struct snd_hwdep *hw,
20 struct snd_hwdep_dsp_image32 __user *src)
21 {
22 struct snd_hwdep_dsp_image info = {};
23 compat_caddr_t ptr;
24
25 if (copy_from_user(&info, src, 4 + 64) ||
26 get_user(ptr, &src->image) ||
27 get_user(info.length, &src->length) ||
28 get_user(info.driver_data, &src->driver_data))
29 return -EFAULT;
30 info.image = compat_ptr(ptr);
31
32 return snd_hwdep_dsp_load(hw, &info);
33 }
34
35 enum {
36 SNDRV_HWDEP_IOCTL_DSP_LOAD32 = _IOW('H', 0x03, struct snd_hwdep_dsp_image32)
37 };
38
snd_hwdep_ioctl_compat(struct file * file,unsigned int cmd,unsigned long arg)39 static long snd_hwdep_ioctl_compat(struct file * file, unsigned int cmd,
40 unsigned long arg)
41 {
42 struct snd_hwdep *hw = file->private_data;
43 void __user *argp = compat_ptr(arg);
44 switch (cmd) {
45 case SNDRV_HWDEP_IOCTL_PVERSION:
46 case SNDRV_HWDEP_IOCTL_INFO:
47 case SNDRV_HWDEP_IOCTL_DSP_STATUS:
48 return snd_hwdep_ioctl(file, cmd, (unsigned long)argp);
49 case SNDRV_HWDEP_IOCTL_DSP_LOAD32:
50 return snd_hwdep_dsp_load_compat(hw, argp);
51 }
52 if (hw->ops.ioctl_compat)
53 return hw->ops.ioctl_compat(hw, file, cmd, arg);
54 return -ENOIOCTLCMD;
55 }
56