From 112e3f5ac505ea0f1e3c59cc757db3c45252c41d Mon Sep 17 00:00:00 2001
From: Takashi Iwai <tiwai@suse.de>
Date: Sun, 2 Feb 2020 10:07:24 +0100
Subject: [PATCH] ALSA: hdsp: Make the firmware loading ioctl a bit more readable
Git-commit: 112e3f5ac505ea0f1e3c59cc757db3c45252c41d
Patch-mainline: v5.6-rc1
References: jsc#SLE-16518
The firmware loading ioctl that is implemented for hdsp hwdep device
takes the reference of the address pointer, hence the current code is
rather confusing. Also, due to the recent change in uapi header,
sparse also complains about the cast.
This patch tries to improve the readability by converting the
straightforward copy_from_user of the whole struct (which contains
only the pointer).
Fixes: d63e63d42107 ("ALSA: hdsp: Make uapi/hdsp.h compilable again")
Link: https://lore.kernel.org/r/20200202090724.18232-2-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
sound/pci/rme9652/hdsp.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)
diff --git a/sound/pci/rme9652/hdsp.c b/sound/pci/rme9652/hdsp.c
index ba2a47dd384c..25b3c5697343 100644
--- a/sound/pci/rme9652/hdsp.c
+++ b/sound/pci/rme9652/hdsp.c
@@ -4802,7 +4802,7 @@ static int snd_hdsp_hwdep_ioctl(struct snd_hwdep *hw, struct file *file, unsigne
break;
}
case SNDRV_HDSP_IOCTL_UPLOAD_FIRMWARE: {
- struct hdsp_firmware __user *firmware;
+ struct hdsp_firmware firmware;
u32 __user *firmware_data;
int err;
@@ -4815,10 +4815,9 @@ static int snd_hdsp_hwdep_ioctl(struct snd_hwdep *hw, struct file *file, unsigne
dev_info(hdsp->card->dev,
"initializing firmware upload\n");
- firmware = (struct hdsp_firmware __user *)argp;
-
- if (get_user(firmware_data, (__force void __user **)&firmware->firmware_data))
+ if (copy_from_user(&firmware, argp, sizeof(firmware)))
return -EFAULT;
+ firmware_data = (u32 __user *)firmware.firmware_data;
if (hdsp_check_for_iobox (hdsp))
return -EIO;
--
2.16.4