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authorTakashi Iwai <tiwai@suse.de>2019-08-25 09:21:44 +0200
committerTakashi Iwai <tiwai@suse.de>2019-08-25 09:31:10 +0200
commit75545304eba6a3d282f923b96a466dc25a81e359 (patch)
tree0b05723013a1044e1518b8b2612fe6f4f1cd5135 /sound
parentf9f0e9ed350e15d51ad07364b4cf910de50c472a (diff)
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 'sound')
-rw-r--r--sound/core/seq/seq_clientmgr.c3
-rw-r--r--sound/core/seq/seq_fifo.c17
-rw-r--r--sound/core/seq/seq_fifo.h2
3 files changed, 20 insertions, 2 deletions
diff --git a/sound/core/seq/seq_clientmgr.c b/sound/core/seq/seq_clientmgr.c
index 7737b2670064..6d9592f0ae1d 100644
--- a/sound/core/seq/seq_clientmgr.c
+++ b/sound/core/seq/seq_clientmgr.c
@@ -1835,8 +1835,7 @@ static int snd_seq_ioctl_get_client_pool(struct snd_seq_client *client,
if (cptr->type == USER_CLIENT) {
info->input_pool = cptr->data.user.fifo_pool_size;
info->input_free = info->input_pool;
- if (cptr->data.user.fifo)
- info->input_free = snd_seq_unused_cells(cptr->data.user.fifo->pool);
+ info->input_free = snd_seq_fifo_unused_cells(cptr->data.user.fifo);
} else {
info->input_pool = 0;
info->input_free = 0;
diff --git a/sound/core/seq/seq_fifo.c b/sound/core/seq/seq_fifo.c
index ea69261f269a..eaaa8b5830bb 100644
--- a/sound/core/seq/seq_fifo.c
+++ b/sound/core/seq/seq_fifo.c
@@ -263,3 +263,20 @@ int snd_seq_fifo_resize(struct snd_seq_fifo *f, int poolsize)
return 0;
}
+
+/* get the number of unused cells safely */
+int snd_seq_fifo_unused_cells(struct snd_seq_fifo *f)
+{
+ unsigned long flags;
+ int cells;
+
+ if (!f)
+ return 0;
+
+ snd_use_lock_use(&f->use_lock);
+ spin_lock_irqsave(&f->lock, flags);
+ cells = snd_seq_unused_cells(f->pool);
+ spin_unlock_irqrestore(&f->lock, flags);
+ snd_use_lock_free(&f->use_lock);
+ return cells;
+}
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