diff options
author | Takashi Iwai <tiwai@suse.de> | 2024-02-22 14:15:02 +0300 |
---|---|---|
committer | Takashi Iwai <tiwai@suse.de> | 2024-02-23 12:57:30 +0300 |
commit | 1052d988226948493eb9730b3424308972eca5f4 (patch) | |
tree | a1150bb31123afe45b33cdc093a826a63157abae /sound | |
parent | ae921398486419c6284d70bd8332eb7edbdb4f70 (diff) | |
download | linux-1052d988226948493eb9730b3424308972eca5f4.tar.xz |
ALSA: control: Use automatic cleanup of kfree()
There are common patterns where a temporary buffer is allocated and
freed at the exit, and those can be simplified with the recent cleanup
mechanism via __free(kfree).
A caveat is that some allocations are memdup_user() and they return an
error pointer instead of NULL. Those need special cares and the value
has to be cleared with no_free_ptr() at the allocation error path.
Other than that, the conversions are straightforward.
No functional changes, only code refactoring.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://lore.kernel.org/r/20240222111509.28390-3-tiwai@suse.de
Diffstat (limited to 'sound')
-rw-r--r-- | sound/core/control.c | 23 | ||||
-rw-r--r-- | sound/core/control_compat.c | 69 |
2 files changed, 34 insertions, 58 deletions
diff --git a/sound/core/control.c b/sound/core/control.c index 59c8658966d4..c8cd70aed6af 100644 --- a/sound/core/control.c +++ b/sound/core/control.c @@ -932,7 +932,7 @@ EXPORT_SYMBOL(snd_ctl_find_id); static int snd_ctl_card_info(struct snd_card *card, struct snd_ctl_file * ctl, unsigned int cmd, void __user *arg) { - struct snd_ctl_card_info *info; + struct snd_ctl_card_info *info __free(kfree) = NULL; info = kzalloc(sizeof(*info), GFP_KERNEL); if (! info) @@ -946,11 +946,8 @@ static int snd_ctl_card_info(struct snd_card *card, struct snd_ctl_file * ctl, strscpy(info->mixername, card->mixername, sizeof(info->mixername)); strscpy(info->components, card->components, sizeof(info->components)); up_read(&snd_ioctl_rwsem); - if (copy_to_user(arg, info, sizeof(struct snd_ctl_card_info))) { - kfree(info); + if (copy_to_user(arg, info, sizeof(struct snd_ctl_card_info))) return -EFAULT; - } - kfree(info); return 0; } @@ -1339,12 +1336,10 @@ static int snd_ctl_elem_read_user(struct snd_card *card, result = snd_ctl_elem_read(card, control); if (result < 0) - goto error; + return result; if (copy_to_user(_control, control, sizeof(*control))) - result = -EFAULT; - error: - kfree(control); + return -EFAULT; return result; } @@ -1406,23 +1401,21 @@ static int snd_ctl_elem_write(struct snd_card *card, struct snd_ctl_file *file, static int snd_ctl_elem_write_user(struct snd_ctl_file *file, struct snd_ctl_elem_value __user *_control) { - struct snd_ctl_elem_value *control; + struct snd_ctl_elem_value *control __free(kfree) = NULL; struct snd_card *card; int result; control = memdup_user(_control, sizeof(*control)); if (IS_ERR(control)) - return PTR_ERR(control); + return PTR_ERR(no_free_ptr(control)); card = file->card; result = snd_ctl_elem_write(card, file, control); if (result < 0) - goto error; + return result; if (copy_to_user(_control, control, sizeof(*control))) - result = -EFAULT; - error: - kfree(control); + return -EFAULT; return result; } diff --git a/sound/core/control_compat.c b/sound/core/control_compat.c index 63d787501066..8392183c77ed 100644 --- a/sound/core/control_compat.c +++ b/sound/core/control_compat.c @@ -79,61 +79,56 @@ struct snd_ctl_elem_info32 { static int snd_ctl_elem_info_compat(struct snd_ctl_file *ctl, struct snd_ctl_elem_info32 __user *data32) { - struct snd_ctl_elem_info *data; + struct snd_ctl_elem_info *data __free(kfree) = NULL; int err; data = kzalloc(sizeof(*data), GFP_KERNEL); if (! data) return -ENOMEM; - err = -EFAULT; /* copy id */ if (copy_from_user(&data->id, &data32->id, sizeof(data->id))) - goto error; + return -EFAULT; /* we need to copy the item index. * hope this doesn't break anything.. */ if (get_user(data->value.enumerated.item, &data32->value.enumerated.item)) - goto error; + return -EFAULT; err = snd_ctl_elem_info(ctl, data); if (err < 0) - goto error; + return err; /* restore info to 32bit */ - err = -EFAULT; /* id, type, access, count */ if (copy_to_user(&data32->id, &data->id, sizeof(data->id)) || copy_to_user(&data32->type, &data->type, 3 * sizeof(u32))) - goto error; + return -EFAULT; if (put_user(data->owner, &data32->owner)) - goto error; + return -EFAULT; switch (data->type) { case SNDRV_CTL_ELEM_TYPE_BOOLEAN: case SNDRV_CTL_ELEM_TYPE_INTEGER: if (put_user(data->value.integer.min, &data32->value.integer.min) || put_user(data->value.integer.max, &data32->value.integer.max) || put_user(data->value.integer.step, &data32->value.integer.step)) - goto error; + return -EFAULT; break; case SNDRV_CTL_ELEM_TYPE_INTEGER64: if (copy_to_user(&data32->value.integer64, &data->value.integer64, sizeof(data->value.integer64))) - goto error; + return -EFAULT; break; case SNDRV_CTL_ELEM_TYPE_ENUMERATED: if (copy_to_user(&data32->value.enumerated, &data->value.enumerated, sizeof(data->value.enumerated))) - goto error; + return -EFAULT; break; default: break; } - err = 0; - error: - kfree(data); - return err; + return 0; } /* read / write */ @@ -169,7 +164,7 @@ static int get_ctl_type(struct snd_card *card, struct snd_ctl_elem_id *id, int *countp) { struct snd_kcontrol *kctl; - struct snd_ctl_elem_info *info; + struct snd_ctl_elem_info *info __free(kfree) = NULL; int err; down_read(&card->controls_rwsem); @@ -193,7 +188,6 @@ static int get_ctl_type(struct snd_card *card, struct snd_ctl_elem_id *id, err = info->type; *countp = info->count; } - kfree(info); return err; } @@ -289,7 +283,7 @@ static int copy_ctl_value_to_user(void __user *userdata, static int ctl_elem_read_user(struct snd_card *card, void __user *userdata, void __user *valuep) { - struct snd_ctl_elem_value *data; + struct snd_ctl_elem_value *data __free(kfree) = NULL; int err, type, count; data = kzalloc(sizeof(*data), GFP_KERNEL); @@ -299,21 +293,18 @@ static int ctl_elem_read_user(struct snd_card *card, err = copy_ctl_value_from_user(card, data, userdata, valuep, &type, &count); if (err < 0) - goto error; + return err; err = snd_ctl_elem_read(card, data); if (err < 0) - goto error; - err = copy_ctl_value_to_user(userdata, valuep, data, type, count); - error: - kfree(data); - return err; + return err; + return copy_ctl_value_to_user(userdata, valuep, data, type, count); } static int ctl_elem_write_user(struct snd_ctl_file *file, void __user *userdata, void __user *valuep) { - struct snd_ctl_elem_value *data; + struct snd_ctl_elem_value *data __free(kfree) = NULL; struct snd_card *card = file->card; int err, type, count; @@ -324,15 +315,12 @@ static int ctl_elem_write_user(struct snd_ctl_file *file, err = copy_ctl_value_from_user(card, data, userdata, valuep, &type, &count); if (err < 0) - goto error; + return err; err = snd_ctl_elem_write(card, file, data); if (err < 0) - goto error; - err = copy_ctl_value_to_user(userdata, valuep, data, type, count); - error: - kfree(data); - return err; + return err; + return copy_ctl_value_to_user(userdata, valuep, data, type, count); } static int snd_ctl_elem_read_user_compat(struct snd_card *card, @@ -366,49 +354,44 @@ static int snd_ctl_elem_add_compat(struct snd_ctl_file *file, struct snd_ctl_elem_info32 __user *data32, int replace) { - struct snd_ctl_elem_info *data; - int err; + struct snd_ctl_elem_info *data __free(kfree) = NULL; data = kzalloc(sizeof(*data), GFP_KERNEL); if (! data) return -ENOMEM; - err = -EFAULT; /* id, type, access, count */ \ if (copy_from_user(&data->id, &data32->id, sizeof(data->id)) || copy_from_user(&data->type, &data32->type, 3 * sizeof(u32))) - goto error; + return -EFAULT; if (get_user(data->owner, &data32->owner)) - goto error; + return -EFAULT; switch (data->type) { case SNDRV_CTL_ELEM_TYPE_BOOLEAN: case SNDRV_CTL_ELEM_TYPE_INTEGER: if (get_user(data->value.integer.min, &data32->value.integer.min) || get_user(data->value.integer.max, &data32->value.integer.max) || get_user(data->value.integer.step, &data32->value.integer.step)) - goto error; + return -EFAULT; break; case SNDRV_CTL_ELEM_TYPE_INTEGER64: if (copy_from_user(&data->value.integer64, &data32->value.integer64, sizeof(data->value.integer64))) - goto error; + return -EFAULT; break; case SNDRV_CTL_ELEM_TYPE_ENUMERATED: if (copy_from_user(&data->value.enumerated, &data32->value.enumerated, sizeof(data->value.enumerated))) - goto error; + return -EFAULT; data->value.enumerated.names_ptr = (uintptr_t)compat_ptr(data->value.enumerated.names_ptr); break; default: break; } - err = snd_ctl_elem_add(file, data, replace); - error: - kfree(data); - return err; + return snd_ctl_elem_add(file, data, replace); } enum { |