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ALSA: info - Check file position validity in common layer

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Check the validity of the file position in the common info layer before
calling read or write callbacks in assumption that entry->size is set up
properly to indicate the max file size.

Removed the redundant checks from the callbacks as well.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai
2010-04-13 11:33:54 +02:00
parent 24e4a1211f
commit d97e1b7823
7 changed files with 60 additions and 105 deletions
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24
sound/pci/cs4281.c
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@@ -1144,17 +1144,11 @@ static ssize_t snd_cs4281_BA0_read(struct snd_info_entry *entry,
struct file *file, char __user *buf,
size_t count, loff_t pos)
{
long size;
struct cs4281 *chip = entry->private_data;
size = count;
if (pos + size > CS4281_BA0_SIZE)
size = (long)CS4281_BA0_SIZE - pos;
if (size > 0) {
if (copy_to_user_fromio(buf, chip->ba0 + pos, size))
return -EFAULT;
}
return size;
if (copy_to_user_fromio(buf, chip->ba0 + pos, count))
return -EFAULT;
return count;
}
static ssize_t snd_cs4281_BA1_read(struct snd_info_entry *entry,
@@ -1162,17 +1156,11 @@ static ssize_t snd_cs4281_BA1_read(struct snd_info_entry *entry,
struct file *file, char __user *buf,
size_t count, loff_t pos)
{
long size;
struct cs4281 *chip = entry->private_data;
size = count;
if (pos + size > CS4281_BA1_SIZE)
size = (long)CS4281_BA1_SIZE - pos;
if (size > 0) {
if (copy_to_user_fromio(buf, chip->ba1 + pos, size))
return -EFAULT;
}
return size;
if (copy_to_user_fromio(buf, chip->ba1 + pos, count))
return -EFAULT;
return count;
}
static struct snd_info_entry_ops snd_cs4281_proc_ops_BA0 = {