diff options
| author | Takashi Iwai <tiwai@suse.de> | 2021-10-06 16:22:14 +0200 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2021-10-07 09:16:56 +0200 |
| commit | 36df2427ac3ea04510368561c8cee22388a7434a (patch) | |
| tree | 998f158183ba7e457652a80571b082858a2c1f16 /sound/core | |
| parent | 23939115be181bc5dbc33aa8471adcdbffa28910 (diff) | |
ALSA: pcm: Add more disconnection checks at file ops
In the case of hot-disconnection of a PCM device, all file operations
except for close should be rejected. This patch adds more sanity
checks in the file operation code paths.
Link: https://lore.kernel.org/r/20211006142214.3089-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/core')
| -rw-r--r-- | sound/core/pcm_native.c | 25 |
1 files changed, 21 insertions, 4 deletions
diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c index d233cb3b41d8..46c643db18eb 100644 --- a/sound/core/pcm_native.c +++ b/sound/core/pcm_native.c @@ -3218,6 +3218,9 @@ static int snd_pcm_common_ioctl(struct file *file, if (PCM_RUNTIME_CHECK(substream)) return -ENXIO; + if (substream->runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) + return -EBADFD; + res = snd_power_wait(substream->pcm->card); if (res < 0) return res; @@ -3344,6 +3347,9 @@ int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, snd_pcm_uframes_t *frames = arg; snd_pcm_sframes_t result; + if (substream->runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) + return -EBADFD; + switch (cmd) { case SNDRV_PCM_IOCTL_FORWARD: { @@ -3386,7 +3392,8 @@ static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count, if (PCM_RUNTIME_CHECK(substream)) return -ENXIO; runtime = substream->runtime; - if (runtime->status->state == SNDRV_PCM_STATE_OPEN) + if (runtime->status->state == SNDRV_PCM_STATE_OPEN || + runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) return -EBADFD; if (!frame_aligned(runtime, count)) return -EINVAL; @@ -3410,7 +3417,8 @@ static ssize_t snd_pcm_write(struct file *file, const char __user *buf, if (PCM_RUNTIME_CHECK(substream)) return -ENXIO; runtime = substream->runtime; - if (runtime->status->state == SNDRV_PCM_STATE_OPEN) + if (runtime->status->state == SNDRV_PCM_STATE_OPEN || + runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) return -EBADFD; if (!frame_aligned(runtime, count)) return -EINVAL; @@ -3436,7 +3444,8 @@ static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to) if (PCM_RUNTIME_CHECK(substream)) return -ENXIO; runtime = substream->runtime; - if (runtime->status->state == SNDRV_PCM_STATE_OPEN) + if (runtime->status->state == SNDRV_PCM_STATE_OPEN || + runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) return -EBADFD; if (!iter_is_iovec(to)) return -EINVAL; @@ -3472,7 +3481,8 @@ static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from) if (PCM_RUNTIME_CHECK(substream)) return -ENXIO; runtime = substream->runtime; - if (runtime->status->state == SNDRV_PCM_STATE_OPEN) + if (runtime->status->state == SNDRV_PCM_STATE_OPEN || + runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) return -EBADFD; if (!iter_is_iovec(from)) return -EINVAL; @@ -3511,6 +3521,9 @@ static __poll_t snd_pcm_poll(struct file *file, poll_table *wait) return ok | EPOLLERR; runtime = substream->runtime; + if (runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) + return ok | EPOLLERR; + poll_wait(file, &runtime->sleep, wait); mask = 0; @@ -3820,6 +3833,8 @@ static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area) substream = pcm_file->substream; if (PCM_RUNTIME_CHECK(substream)) return -ENXIO; + if (substream->runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) + return -EBADFD; offset = area->vm_pgoff << PAGE_SHIFT; switch (offset) { @@ -3856,6 +3871,8 @@ static int snd_pcm_fasync(int fd, struct file * file, int on) if (PCM_RUNTIME_CHECK(substream)) return -ENXIO; runtime = substream->runtime; + if (runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) + return -EBADFD; return fasync_helper(fd, file, on, &runtime->fasync); } |