add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/sound/core/hwdep_compat.c
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@@ -1,21 +1,7 @@
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+// SPDX-License-Identifier: GPL-2.0-or-later
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 /*
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  *   32bit -> 64bit ioctl wrapper for hwdep API
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  *   Copyright (c) by Takashi Iwai <tiwai@suse.de>
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- *
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- *   This program is free software; you can redistribute it and/or modify
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- *   it under the terms of the GNU General Public License as published by
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- *   the Free Software Foundation; either version 2 of the License, or
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- *   (at your option) any later version.
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- *
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- *   This program is distributed in the hope that it will be useful,
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- *   but WITHOUT ANY WARRANTY; without even the implied warranty of
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- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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- *   GNU General Public License for more details.
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- *
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- *   You should have received a copy of the GNU General Public License
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- *   along with this program; if not, write to the Free Software
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- *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
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- *
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  */
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 /* This file is included from hwdep.c */
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@@ -33,26 +19,17 @@
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 static int snd_hwdep_dsp_load_compat(struct snd_hwdep *hw,
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 				     struct snd_hwdep_dsp_image32 __user *src)
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 {
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-	struct snd_hwdep_dsp_image __user *dst;
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+	struct snd_hwdep_dsp_image info = {};
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 	compat_caddr_t ptr;
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-	u32 val;
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-	dst = compat_alloc_user_space(sizeof(*dst));
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+	if (copy_from_user(&info, src, 4 + 64) ||
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+	    get_user(ptr, &src->image) ||
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+	    get_user(info.length, &src->length) ||
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+	    get_user(info.driver_data, &src->driver_data))
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+		return -EFAULT;
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+	info.image = compat_ptr(ptr);
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-	/* index and name */
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-	if (copy_in_user(dst, src, 4 + 64))
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-		return -EFAULT;
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-	if (get_user(ptr, &src->image) ||
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-	    put_user(compat_ptr(ptr), &dst->image))
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-		return -EFAULT;
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-	if (get_user(val, &src->length) ||
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-	    put_user(val, &dst->length))
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-		return -EFAULT;
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-	if (get_user(val, &src->driver_data) ||
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-	    put_user(val, &dst->driver_data))
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-		return -EFAULT;
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-
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-	return snd_hwdep_dsp_load(hw, dst);
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+	return snd_hwdep_dsp_load(hw, &info);
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 }
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 enum {