diff options
author | Takashi Iwai <tiwai@suse.de> | 2017-06-02 15:03:38 +0200 |
---|---|---|
committer | Sasha Levin <alexander.levin@verizon.com> | 2017-06-25 22:02:19 -0400 |
commit | 5d28ba6eecdeb3bbd0f78948ca3470918aad13fa (patch) | |
tree | 171f7d6162977cf03afa924d7d0dea90d9f82d60 /sound | |
parent | 29837be8e9222ab4e4bcd9a46eb57306b2f9d976 (diff) |
ALSA: timer: Fix race between read and ioctl
[ Upstream commit d11662f4f798b50d8c8743f433842c3e40fe3378 ]
The read from ALSA timer device, the function snd_timer_user_tread(),
may access to an uninitialized struct snd_timer_user fields when the
read is concurrently performed while the ioctl like
snd_timer_user_tselect() is invoked. We have already fixed the races
among ioctls via a mutex, but we seem to have forgotten the race
between read vs ioctl.
This patch simply applies (more exactly extends the already applied
range of) tu->ioctl_lock in snd_timer_user_tread() for closing the
race window.
Reported-by: Alexander Potapenko <glider@google.com>
Tested-by: Alexander Potapenko <glider@google.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Diffstat (limited to 'sound')
-rw-r--r-- | sound/core/timer.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/sound/core/timer.c b/sound/core/timer.c index b024ef0ec32b..add535ddc462 100644 --- a/sound/core/timer.c +++ b/sound/core/timer.c @@ -1956,6 +1956,7 @@ static ssize_t snd_timer_user_read(struct file *file, char __user *buffer, tu = file->private_data; unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read); + mutex_lock(&tu->ioctl_lock); spin_lock_irq(&tu->qlock); while ((long)count - result >= unit) { while (!tu->qused) { @@ -1971,7 +1972,9 @@ static ssize_t snd_timer_user_read(struct file *file, char __user *buffer, add_wait_queue(&tu->qchange_sleep, &wait); spin_unlock_irq(&tu->qlock); + mutex_unlock(&tu->ioctl_lock); schedule(); + mutex_lock(&tu->ioctl_lock); spin_lock_irq(&tu->qlock); remove_wait_queue(&tu->qchange_sleep, &wait); @@ -1991,7 +1994,6 @@ static ssize_t snd_timer_user_read(struct file *file, char __user *buffer, tu->qused--; spin_unlock_irq(&tu->qlock); - mutex_lock(&tu->ioctl_lock); if (tu->tread) { if (copy_to_user(buffer, &tu->tqueue[qhead], sizeof(struct snd_timer_tread))) @@ -2001,7 +2003,6 @@ static ssize_t snd_timer_user_read(struct file *file, char __user *buffer, sizeof(struct snd_timer_read))) err = -EFAULT; } - mutex_unlock(&tu->ioctl_lock); spin_lock_irq(&tu->qlock); if (err < 0) @@ -2011,6 +2012,7 @@ static ssize_t snd_timer_user_read(struct file *file, char __user *buffer, } _error: spin_unlock_irq(&tu->qlock); + mutex_unlock(&tu->ioctl_lock); return result > 0 ? result : err; } |