1 files changed, 55 insertions, 0 deletions
diff --git a/sound/core/hwdep_compat.c b/sound/core/hwdep_compat.c
new file mode 100644
index 000000000..a0b76706c
--- /dev/null
+++ b/sound/core/hwdep_compat.c
@@ -0,0 +1,55 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *   32bit -> 64bit ioctl wrapper for hwdep API
+ *   Copyright (c) by Takashi Iwai <tiwai@suse.de>
+ */
+
+/* This file is included from hwdep.c */
+
+#include <linux/compat.h>
+
+struct snd_hwdep_dsp_image32 {
+	u32 index;
+	unsigned char name[64];
+	u32 image;	/* pointer */
+	u32 length;
+	u32 driver_data;
+} /* don't set packed attribute here */;
+
+static int snd_hwdep_dsp_load_compat(struct snd_hwdep *hw,
+				     struct snd_hwdep_dsp_image32 __user *src)
+{
+	struct snd_hwdep_dsp_image info = {};
+	compat_caddr_t ptr;
+
+	if (copy_from_user(&info, src, 4 + 64) ||
+	    get_user(ptr, &src->image) ||
+	    get_user(info.length, &src->length) ||
+	    get_user(info.driver_data, &src->driver_data))
+		return -EFAULT;
+	info.image = compat_ptr(ptr);
+
+	return snd_hwdep_dsp_load(hw, &info);
+}
+
+enum {
+	SNDRV_HWDEP_IOCTL_DSP_LOAD32   = _IOW('H', 0x03, struct snd_hwdep_dsp_image32)
+};
+
+static long snd_hwdep_ioctl_compat(struct file * file, unsigned int cmd,
+				   unsigned long arg)
+{
+	struct snd_hwdep *hw = file->private_data;
+	void __user *argp = compat_ptr(arg);
+	switch (cmd) {
+	case SNDRV_HWDEP_IOCTL_PVERSION:
+	case SNDRV_HWDEP_IOCTL_INFO:
+	case SNDRV_HWDEP_IOCTL_DSP_STATUS:
+		return snd_hwdep_ioctl(file, cmd, (unsigned long)argp);
+	case SNDRV_HWDEP_IOCTL_DSP_LOAD32:
+		return snd_hwdep_dsp_load_compat(hw, argp);
+	}
+	if (hw->ops.ioctl_compat)
+		return hw->ops.ioctl_compat(hw, file, cmd, arg);
+	return -ENOIOCTLCMD;
+}