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| author | Takashi Iwai <tiwai@suse.de> | 2010-04-13 13:33:54 +0400 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2010-04-13 14:01:14 +0400 |
| commit | d97e1b78239c7e7e441088e0b644bd3b076002e6 (patch) | |
| tree | b05b5085bea932662ce60061d5b4b93834683327 /sound/pci/cs4281.c | |
| parent | 24e4a1211f691fc671de44685430dbad757d8487 (diff) | |
| download | linux-d97e1b78239c7e7e441088e0b644bd3b076002e6.tar.xz | |
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 <tiwai@suse.de>
Diffstat (limited to 'sound/pci/cs4281.c')
| -rw-r--r-- | sound/pci/cs4281.c | 24 |
1 files changed, 6 insertions, 18 deletions
diff --git a/sound/pci/cs4281.c b/sound/pci/cs4281.c index b0bba2e86b12..6772070ed492 100644 --- a/sound/pci/cs4281.c +++ b/sound/pci/cs4281.c @@ -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 = { |