From 8fec560d9beb3957bf45ac93b1c0c616abd77a07 Mon Sep 17 00:00:00 2001 From: Takashi Iwai Date: Thu, 1 Feb 2007 11:50:56 +0100 Subject: [PATCH] [ALSA] usbaudio - Fix Oops with unconventional sample rates 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 Signed-off-by: Jaroslav Kysela --- sound/usb/usbaudio.c | 45 +++++++++++++++++++++++++------------------- 1 file changed, 26 insertions(+), 19 deletions(-) diff --git a/sound/usb/usbaudio.c b/sound/usb/usbaudio.c index 56e42b88addf..8fd37596e3a1 100644 --- a/sound/usb/usbaudio.c +++ b/sound/usb/usbaudio.c @@ -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); } -- 2.20.1