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| author |   Takashi Iwai <tiwai@suse.de> | 2020-04-24 09:40:16 +0200 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2020-04-24 09:55:08 +0200 |
| commit | 5b6cc38f3f3f37109ce72b60bda215a5f6892c0b (patch) | |
| tree | fb7bf4df502f86f6cf8ce5d48bafe316a31ecf72 /sound/usb | |
| parent | ALSA: usb-audio: Remove async workaround for Scarlett 2nd gen (diff) | |
| download | linux-dev-5b6cc38f3f3f37109ce72b60bda215a5f6892c0b.tar.xz linux-dev-5b6cc38f3f3f37109ce72b60bda215a5f6892c0b.zip | |
ALSA: usb-audio: Fix racy list management in output queue
The linked list entry from FIFO is peeked at
queue_pending_output_urbs() but the actual element pop-out is
performed outside the spinlock, and it's potentially racy.
Do delete the link at the right place inside the spinlock.
Fixes: 8fdff6a319e7 ("ALSA: snd-usb: implement new endpoint streaming model")
Link: https://lore.kernel.org/r/20200424074016.14301-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/usb')
| -rw-r--r-- | sound/usb/endpoint.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/sound/usb/endpoint.c b/sound/usb/endpoint.c index d8dc7cb56d43..50104f658ed4 100644 --- a/sound/usb/endpoint.c +++ b/sound/usb/endpoint.c @@ -346,17 +346,17 @@ static void queue_pending_output_urbs(struct snd_usb_endpoint *ep) ep->next_packet_read_pos %= MAX_URBS; /* take URB out of FIFO */ - if (!list_empty(&ep->ready_playback_urbs)) + if (!list_empty(&ep->ready_playback_urbs)) { ctx = list_first_entry(&ep->ready_playback_urbs, struct snd_urb_ctx, ready_list); + list_del_init(&ctx->ready_list); + } } spin_unlock_irqrestore(&ep->lock, flags); if (ctx == NULL) return; - list_del_init(&ctx->ready_list); - /* copy over the length information */ for (i = 0; i < packet->packets; i++) ctx->packet_size[i] = packet->packet_size[i]; |