diff options
| author |   Takashi Iwai <tiwai@suse.de> | 2019-08-25 09:21:44 +0200 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2019-08-25 09:31:10 +0200 |
| commit | 75545304eba6a3d282f923b96a466dc25a81e359 (patch) | |
| tree | 0b05723013a1044e1518b8b2612fe6f4f1cd5135 /sound/core/seq/seq_fifo.h | |
| parent | ALSA: usb-audio: Check mixer unit bitmap yet more strictly (diff) | |
| download | linux-dev-75545304eba6a3d282f923b96a466dc25a81e359.tar.xz linux-dev-75545304eba6a3d282f923b96a466dc25a81e359.zip | |
ALSA: seq: Fix potential concurrent access to the deleted pool
The input pool of a client might be deleted via the resize ioctl, the
the access to it should be covered by the proper locks. Currently the
only missing place is the call in snd_seq_ioctl_get_client_pool(), and
this patch papers over it.
Reported-by: syzbot+4a75454b9ca2777f35c7@syzkaller.appspotmail.com
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to '')
| -rw-r--r-- | sound/core/seq/seq_fifo.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/sound/core/seq/seq_fifo.h b/sound/core/seq/seq_fifo.h index edc68743943d..b56a7b897c9c 100644 --- a/sound/core/seq/seq_fifo.h +++ b/sound/core/seq/seq_fifo.h @@ -53,5 +53,7 @@ int snd_seq_fifo_poll_wait(struct snd_seq_fifo *f, struct file *file, poll_table /* resize pool in fifo */ int snd_seq_fifo_resize(struct snd_seq_fifo *f, int poolsize); +/* get the number of unused cells safely */ +int snd_seq_fifo_unused_cells(struct snd_seq_fifo *f); #endif |