diff options
author | Takashi Iwai <tiwai@suse.de> | 2016-02-08 17:26:58 +0100 |
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committer | Takashi Iwai <tiwai@suse.de> | 2016-02-09 12:23:42 +0100 |
commit | 4dff5c7b7093b19c19d3a100f8a3ad87cb7cd9e7 (patch) | |
tree | f2b107d1d85650e5a9efb06f1f13da19e8644648 | |
parent | ed8b1d6d2c741ab26d60d499d7fbb7ac801f0f51 (diff) | |
download | op-kernel-dev-4dff5c7b7093b19c19d3a100f8a3ad87cb7cd9e7.zip op-kernel-dev-4dff5c7b7093b19c19d3a100f8a3ad87cb7cd9e7.tar.gz |
ALSA: timer: Fix race at concurrent reads
snd_timer_user_read() has a potential race among parallel reads, as
qhead and qused are updated outside the critical section due to
copy_to_user() calls. Move them into the critical section, and also
sanitize the relevant code a bit.
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
-rw-r--r-- | sound/core/timer.c | 34 |
1 files changed, 15 insertions, 19 deletions
diff --git a/sound/core/timer.c b/sound/core/timer.c index a0405b0..dca817f 100644 --- a/sound/core/timer.c +++ b/sound/core/timer.c @@ -1933,6 +1933,7 @@ static ssize_t snd_timer_user_read(struct file *file, char __user *buffer, { struct snd_timer_user *tu; long result = 0, unit; + int qhead; int err = 0; tu = file->private_data; @@ -1944,7 +1945,7 @@ static ssize_t snd_timer_user_read(struct file *file, char __user *buffer, if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) { err = -EAGAIN; - break; + goto _error; } set_current_state(TASK_INTERRUPTIBLE); @@ -1959,42 +1960,37 @@ static ssize_t snd_timer_user_read(struct file *file, char __user *buffer, if (tu->disconnected) { err = -ENODEV; - break; + goto _error; } if (signal_pending(current)) { err = -ERESTARTSYS; - break; + goto _error; } } + qhead = tu->qhead++; + tu->qhead %= tu->queue_size; spin_unlock_irq(&tu->qlock); - if (err < 0) - goto _error; if (tu->tread) { - if (copy_to_user(buffer, &tu->tqueue[tu->qhead++], - sizeof(struct snd_timer_tread))) { + if (copy_to_user(buffer, &tu->tqueue[qhead], + sizeof(struct snd_timer_tread))) err = -EFAULT; - goto _error; - } } else { - if (copy_to_user(buffer, &tu->queue[tu->qhead++], - sizeof(struct snd_timer_read))) { + if (copy_to_user(buffer, &tu->queue[qhead], + sizeof(struct snd_timer_read))) err = -EFAULT; - goto _error; - } } - tu->qhead %= tu->queue_size; - - result += unit; - buffer += unit; - spin_lock_irq(&tu->qlock); tu->qused--; + if (err < 0) + goto _error; + result += unit; + buffer += unit; } - spin_unlock_irq(&tu->qlock); _error: + spin_unlock_irq(&tu->qlock); return result > 0 ? result : err; } |