sound/core/hwdep_compat.c

   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
  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
  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 }