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ALSA: info - Check file position validity in common layer

Sfoglia il codice sorgente 
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 ha cambiato i file con 60 aggiunte e 105 eliminazioni
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12
sound/pci/mixart/mixart.c
Vedi File

@@ -1161,13 +1161,7 @@ static ssize_t snd_mixart_BA0_read(struct snd_info_entry *entry,
size_t count, loff_t pos)
{
struct mixart_mgr *mgr = entry->private_data;
unsigned long maxsize;
if (pos >= MIXART_BA0_SIZE)
return 0;
maxsize = MIXART_BA0_SIZE - pos;
if (count > maxsize)
count = maxsize;
count = count & ~3; /* make sure the read size is a multiple of 4 bytes */
if (copy_to_user_fromio(buf, MIXART_MEM(mgr, pos), count))
return -EFAULT;
@@ -1183,13 +1177,7 @@ static ssize_t snd_mixart_BA1_read(struct snd_info_entry *entry,
size_t count, loff_t pos)
{
struct mixart_mgr *mgr = entry->private_data;
unsigned long maxsize;
if (pos > MIXART_BA1_SIZE)
return 0;
maxsize = MIXART_BA1_SIZE - pos;
if (count > maxsize)
count = maxsize;
count = count & ~3; /* make sure the read size is a multiple of 4 bytes */
if (copy_to_user_fromio(buf, MIXART_REG(mgr, pos), count))
return -EFAULT;