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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 <[email protected]>
This commit is contained in:
Takashi Iwai 2010-04-13 11:33:54 +02:00
commit d97e1b7823
7 changed files with 60 additions and 105 deletions
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14
sound/isa/gus/gus_mem_proc.c
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@ -36,20 +36,14 @@ static ssize_t snd_gf1_mem_proc_dump(struct snd_info_entry *entry,
struct file *file, char __user *buf,
size_t count, loff_t pos)
{
long size;
struct gus_proc_private *priv = entry->private_data;
struct snd_gus_card *gus = priv->gus;
int err;
size = count;
if (pos + size > priv->size)
size = (long)priv->size - pos;
if (size > 0) {
if ((err = snd_gus_dram_read(gus, buf, pos, size, priv->rom)) < 0)
return err;
return size;
}
return 0;
err = snd_gus_dram_read(gus, buf, pos, count, priv->rom);
if (err < 0)
return err;
return count;
}
static loff_t snd_gf1_mem_proc_llseek(struct snd_info_entry *entry,