From d97e1b78239c7e7e441088e0b644bd3b076002e6 Mon Sep 17 00:00:00 2001 From: Takashi Iwai Date: Tue, 13 Apr 2010 11:33:54 +0200 Subject: ALSA: info - Check file position validity in common layer 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 --- sound/pci/cs46xx/cs46xx_lib.c | 12 +++--------- 1 file changed, 3 insertions(+), 9 deletions(-) (limited to 'sound/pci/cs46xx/cs46xx_lib.c') diff --git a/sound/pci/cs46xx/cs46xx_lib.c b/sound/pci/cs46xx/cs46xx_lib.c index 08117b142381..aad37082cb6e 100644 --- a/sound/pci/cs46xx/cs46xx_lib.c +++ b/sound/pci/cs46xx/cs46xx_lib.c @@ -2662,17 +2662,11 @@ static ssize_t snd_cs46xx_io_read(struct snd_info_entry *entry, struct file *file, char __user *buf, size_t count, loff_t pos) { - long size; struct snd_cs46xx_region *region = entry->private_data; - size = count; - if (pos + (size_t)size > region->size) - size = region->size - pos; - if (size > 0) { - if (copy_to_user_fromio(buf, region->remap_addr + pos, size)) - return -EFAULT; - } - return size; + if (copy_to_user_fromio(buf, region->remap_addr + pos, count)) + return -EFAULT; + return count; } static struct snd_info_entry_ops snd_cs46xx_proc_io_ops = { -- cgit v1.2.3