LXR linux/sound/core/hwdep

   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
  11struct 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
  19static 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 __user *dst;
  23        compat_caddr_t ptr;
  24        u32 val;
  25
  26        dst = compat_alloc_user_space(sizeof(*dst));
  27
  28        /* index and name */
  29        if (copy_in_user(dst, src, 4 + 64))
  30                return -EFAULT;
  31        if (get_user(ptr, &src->image) ||
  32            put_user(compat_ptr(ptr), &dst->image))
  33                return -EFAULT;
  34        if (get_user(val, &src->length) ||
  35            put_user(val, &dst->length))
  36                return -EFAULT;
  37        if (get_user(val, &src->driver_data) ||
  38            put_user(val, &dst->driver_data))
  39                return -EFAULT;
  40
  41        return snd_hwdep_dsp_load(hw, dst);
  42}
  43
  44enum {
  45        SNDRV_HWDEP_IOCTL_DSP_LOAD32   = _IOW('H', 0x03, struct snd_hwdep_dsp_image32)
  46};
  47
  48static long snd_hwdep_ioctl_compat(struct file * file, unsigned int cmd,
  49                                   unsigned long arg)
  50{
  51        struct snd_hwdep *hw = file->private_data;
  52        void __user *argp = compat_ptr(arg);
  53        switch (cmd) {
  54        case SNDRV_HWDEP_IOCTL_PVERSION:
  55        case SNDRV_HWDEP_IOCTL_INFO:
  56        case SNDRV_HWDEP_IOCTL_DSP_STATUS:
  57                return snd_hwdep_ioctl(file, cmd, (unsigned long)argp);
  58        case SNDRV_HWDEP_IOCTL_DSP_LOAD32:
  59                return snd_hwdep_dsp_load_compat(hw, argp);
  60        }
  61        if (hw->ops.ioctl_compat)
  62                return hw->ops.ioctl_compat(hw, file, cmd, arg);
  63        return -ENOIOCTLCMD;
  64}
  65