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[ALSA] usbaudio - Fix Oops with unconventional sample rates

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The patch fixes the memory corruption by the support of unconventional
sample rates.  Also, it avoids the too restrictive constraints if
any of usb descriptions contain continuous rates.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>
This commit is contained in:
Takashi Iwai 2007-02-01 11:50:56 +01:00 committed by Jaroslav Kysela
parent 3b6baa5a0b
commit 8fec560d9b
1 changed files with 26 additions and 19 deletions
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45
sound/usb/usbaudio.c
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@ -186,6 +186,7 @@ struct snd_usb_substream {
u64 formats; /* format bitmasks (all or'ed) */
unsigned int num_formats; /* number of supported audio formats (list) */
struct list_head fmt_list; /* format list */
struct snd_pcm_hw_constraint_list rate_list; /* limited rates */
spinlock_t lock;
struct snd_urb_ops ops; /* callbacks (must be filled at init) */
@ -1818,28 +1819,33 @@ static int check_hw_params_convention(struct snd_usb_substream *subs)
static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
struct snd_usb_substream *subs)
{
struct list_head *p;
struct snd_pcm_hw_constraint_list constraints_rates;
struct audioformat *fp;
int count = 0, needs_knot = 0;
int err;
list_for_each(p, &subs->fmt_list) {
struct audioformat *fp;
fp = list_entry(p, struct audioformat, list);
if (!fp->needs_knot)
continue;
constraints_rates.count = fp->nr_rates;
constraints_rates.list = fp->rate_table;
constraints_rates.mask = 0;
err = snd_pcm_hw_constraint_list(runtime, 0,
SNDRV_PCM_HW_PARAM_RATE,
&constraints_rates);
if (err < 0)
return err;
list_for_each_entry(fp, &subs->fmt_list, list) {
if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
return 0;
count += fp->nr_rates;
if (fp->needs_knot)
needs_knot = 1;
}
if (!needs_knot)
return 0;
subs->rate_list.count = count;
subs->rate_list.list = kmalloc(sizeof(int) * count, GFP_KERNEL);
subs->rate_list.mask = 0;
count = 0;
list_for_each_entry(fp, &subs->fmt_list, list) {
int i;
for (i = 0; i < fp->nr_rates; i++)
subs->rate_list.list[count++] = fp->rate_table[i];
}
err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
&subs->rate_list);
if (err < 0)
return err;
return 0;
}
@ -2238,6 +2244,7 @@ static void free_substream(struct snd_usb_substream *subs)
kfree(fp->rate_table);
kfree(fp);
}
kfree(subs->rate_list.list);
}