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authorTakashi Iwai <tiwai@suse.de>2006-11-14 13:03:19 +0100
committerJaroslav Kysela <perex@server.perex.cz>2006-12-20 08:55:54 +0100
commite3a5d59a17e9a42e3f3e0e37342b2679bab2ff43 (patch)
tree631335a715870175f194b4bfec4690e6041fed79 /sound
parentba8bdf8584c6f8af6d009dfd716ea5ee37fc15cd (diff)
downloadlinux-linaro-stable-e3a5d59a17e9a42e3f3e0e37342b2679bab2ff43.tar.gz
[ALSA] Fix races in PCM OSS emulation
Fixed the race among multiple threads accessing the OSS PCM instance concurrently by simply introducing a mutex for protecting a setup of the PCM. Signed-off-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Jaroslav Kysela <perex@suse.cz>
Diffstat (limited to 'sound')
-rw-r--r--sound/core/oss/pcm_oss.c52
1 files changed, 40 insertions, 12 deletions
diff --git a/sound/core/oss/pcm_oss.c b/sound/core/oss/pcm_oss.c
index e0821eb3d851..786a82e68890 100644
--- a/sound/core/oss/pcm_oss.c
+++ b/sound/core/oss/pcm_oss.c
@@ -810,6 +810,8 @@ static int snd_pcm_oss_change_params(struct snd_pcm_substream *substream)
struct snd_mask sformat_mask;
struct snd_mask mask;
+ if (mutex_lock_interruptible(&runtime->oss.params_lock))
+ return -EINTR;
sw_params = kmalloc(sizeof(*sw_params), GFP_KERNEL);
params = kmalloc(sizeof(*params), GFP_KERNEL);
sparams = kmalloc(sizeof(*sparams), GFP_KERNEL);
@@ -1020,6 +1022,7 @@ failure:
kfree(sw_params);
kfree(params);
kfree(sparams);
+ mutex_unlock(&runtime->oss.params_lock);
return err;
}
@@ -1307,14 +1310,17 @@ static ssize_t snd_pcm_oss_write1(struct snd_pcm_substream *substream, const cha
if ((tmp = snd_pcm_oss_make_ready(substream)) < 0)
return tmp;
+ mutex_lock(&runtime->oss.params_lock);
while (bytes > 0) {
if (bytes < runtime->oss.period_bytes || runtime->oss.buffer_used > 0) {
tmp = bytes;
if (tmp + runtime->oss.buffer_used > runtime->oss.period_bytes)
tmp = runtime->oss.period_bytes - runtime->oss.buffer_used;
if (tmp > 0) {
- if (copy_from_user(runtime->oss.buffer + runtime->oss.buffer_used, buf, tmp))
- return xfer > 0 ? (snd_pcm_sframes_t)xfer : -EFAULT;
+ if (copy_from_user(runtime->oss.buffer + runtime->oss.buffer_used, buf, tmp)) {
+ tmp = -EFAULT;
+ goto err;
+ }
}
runtime->oss.buffer_used += tmp;
buf += tmp;
@@ -1325,22 +1331,24 @@ static ssize_t snd_pcm_oss_write1(struct snd_pcm_substream *substream, const cha
tmp = snd_pcm_oss_write2(substream, runtime->oss.buffer + runtime->oss.period_ptr,
runtime->oss.buffer_used - runtime->oss.period_ptr, 1);
if (tmp <= 0)
- return xfer > 0 ? (snd_pcm_sframes_t)xfer : tmp;
+ goto err;
runtime->oss.bytes += tmp;
runtime->oss.period_ptr += tmp;
runtime->oss.period_ptr %= runtime->oss.period_bytes;
if (runtime->oss.period_ptr == 0 ||
runtime->oss.period_ptr == runtime->oss.buffer_used)
runtime->oss.buffer_used = 0;
- else if ((substream->f_flags & O_NONBLOCK) != 0)
- return xfer > 0 ? xfer : -EAGAIN;
+ else if ((substream->f_flags & O_NONBLOCK) != 0) {
+ tmp = -EAGAIN;
+ goto err;
+ }
}
} else {
tmp = snd_pcm_oss_write2(substream,
(const char __force *)buf,
runtime->oss.period_bytes, 0);
if (tmp <= 0)
- return xfer > 0 ? (snd_pcm_sframes_t)xfer : tmp;
+ goto err;
runtime->oss.bytes += tmp;
buf += tmp;
bytes -= tmp;
@@ -1350,7 +1358,12 @@ static ssize_t snd_pcm_oss_write1(struct snd_pcm_substream *substream, const cha
break;
}
}
+ mutex_unlock(&runtime->oss.params_lock);
return xfer;
+
+ err:
+ mutex_unlock(&runtime->oss.params_lock);
+ return xfer > 0 ? (snd_pcm_sframes_t)xfer : tmp;
}
static ssize_t snd_pcm_oss_read2(struct snd_pcm_substream *substream, char *buf, size_t bytes, int in_kernel)
@@ -1397,12 +1410,13 @@ static ssize_t snd_pcm_oss_read1(struct snd_pcm_substream *substream, char __use
if ((tmp = snd_pcm_oss_make_ready(substream)) < 0)
return tmp;
+ mutex_lock(&runtime->oss.params_lock);
while (bytes > 0) {
if (bytes < runtime->oss.period_bytes || runtime->oss.buffer_used > 0) {
if (runtime->oss.buffer_used == 0) {
tmp = snd_pcm_oss_read2(substream, runtime->oss.buffer, runtime->oss.period_bytes, 1);
if (tmp <= 0)
- return xfer > 0 ? (snd_pcm_sframes_t)xfer : tmp;
+ goto err;
runtime->oss.bytes += tmp;
runtime->oss.period_ptr = tmp;
runtime->oss.buffer_used = tmp;
@@ -1410,8 +1424,10 @@ static ssize_t snd_pcm_oss_read1(struct snd_pcm_substream *substream, char __use
tmp = bytes;
if ((size_t) tmp > runtime->oss.buffer_used)
tmp = runtime->oss.buffer_used;
- if (copy_to_user(buf, runtime->oss.buffer + (runtime->oss.period_ptr - runtime->oss.buffer_used), tmp))
- return xfer > 0 ? (snd_pcm_sframes_t)xfer : -EFAULT;
+ if (copy_to_user(buf, runtime->oss.buffer + (runtime->oss.period_ptr - runtime->oss.buffer_used), tmp)) {
+ tmp = -EFAULT;
+ goto err;
+ }
buf += tmp;
bytes -= tmp;
xfer += tmp;
@@ -1420,14 +1436,19 @@ static ssize_t snd_pcm_oss_read1(struct snd_pcm_substream *substream, char __use
tmp = snd_pcm_oss_read2(substream, (char __force *)buf,
runtime->oss.period_bytes, 0);
if (tmp <= 0)
- return xfer > 0 ? (snd_pcm_sframes_t)xfer : tmp;
+ goto err;
runtime->oss.bytes += tmp;
buf += tmp;
bytes -= tmp;
xfer += tmp;
}
}
+ mutex_unlock(&runtime->oss.params_lock);
return xfer;
+
+ err:
+ mutex_unlock(&runtime->oss.params_lock);
+ return xfer > 0 ? (snd_pcm_sframes_t)xfer : tmp;
}
static int snd_pcm_oss_reset(struct snd_pcm_oss_file *pcm_oss_file)
@@ -1528,6 +1549,7 @@ static int snd_pcm_oss_sync(struct snd_pcm_oss_file *pcm_oss_file)
return err;
format = snd_pcm_oss_format_from(runtime->oss.format);
width = snd_pcm_format_physical_width(format);
+ mutex_lock(&runtime->oss.params_lock);
if (runtime->oss.buffer_used > 0) {
#ifdef OSS_DEBUG
printk("sync: buffer_used\n");
@@ -1537,8 +1559,10 @@ static int snd_pcm_oss_sync(struct snd_pcm_oss_file *pcm_oss_file)
runtime->oss.buffer + runtime->oss.buffer_used,
size);
err = snd_pcm_oss_sync1(substream, runtime->oss.period_bytes);
- if (err < 0)
+ if (err < 0) {
+ mutex_unlock(&runtime->oss.params_lock);
return err;
+ }
} else if (runtime->oss.period_ptr > 0) {
#ifdef OSS_DEBUG
printk("sync: period_ptr\n");
@@ -1548,8 +1572,10 @@ static int snd_pcm_oss_sync(struct snd_pcm_oss_file *pcm_oss_file)
runtime->oss.buffer,
size * 8 / width);
err = snd_pcm_oss_sync1(substream, size);
- if (err < 0)
+ if (err < 0) {
+ mutex_unlock(&runtime->oss.params_lock);
return err;
+ }
}
/*
* The ALSA's period might be a bit large than OSS one.
@@ -1579,6 +1605,7 @@ static int snd_pcm_oss_sync(struct snd_pcm_oss_file *pcm_oss_file)
snd_pcm_lib_writev(substream, buffers, size);
}
}
+ mutex_unlock(&runtime->oss.params_lock);
/*
* finish sync: drain the buffer
*/
@@ -2172,6 +2199,7 @@ static void snd_pcm_oss_init_substream(struct snd_pcm_substream *substream,
runtime->oss.params = 1;
runtime->oss.trigger = 1;
runtime->oss.rate = 8000;
+ mutex_init(&runtime->oss.params_lock);
switch (SNDRV_MINOR_OSS_DEVICE(minor)) {
case SNDRV_MINOR_OSS_PCM_8:
runtime->oss.format = AFMT_U8;