[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <20200623195319.919537541@linuxfoundation.org>
Date: Tue, 23 Jun 2020 21:56:28 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Takashi Iwai <tiwai@...e.de>,
Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 060/206] ALSA: usb-audio: Fix racy list management in output queue
From: Takashi Iwai <tiwai@...e.de>
[ Upstream commit 5b6cc38f3f3f37109ce72b60bda215a5f6892c0b ]
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@...e.de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
sound/usb/endpoint.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/sound/usb/endpoint.c b/sound/usb/endpoint.c
index 36e255d889372..48611849b79b6 100644
--- a/sound/usb/endpoint.c
+++ b/sound/usb/endpoint.c
@@ -359,17 +359,17 @@ 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];
--
2.25.1
Powered by blists - more mailing lists