diff mbox series

[5.10,050/103] usb: gadget: u_audio: fix race condition on endpoint stop

Message ID 20210901122302.256387763@linuxfoundation.org
State Superseded
Headers show
Series None | expand

Commit Message

Greg Kroah-Hartman Sept. 1, 2021, 12:28 p.m. UTC 
From: Jerome Brunet <jbrunet@baylibre.com>


[ Upstream commit 068fdad20454f815e61e6f6eb9f051a8b3120e88 ]

If the endpoint completion callback is call right after the ep_enabled flag
is cleared and before usb_ep_dequeue() is call, we could do a double free
on the request and the associated buffer.

Fix this by clearing ep_enabled after all the endpoint requests have been
dequeued.

Fixes: 7de8681be2cd ("usb: gadget: u_audio: Free requests only after callback")
Cc: stable <stable@vger.kernel.org>
Reported-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>

Link: https://lore.kernel.org/r/20210827092927.366482-1-jbrunet@baylibre.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Signed-off-by: Sasha Levin <sashal@kernel.org>

---
 drivers/usb/gadget/function/u_audio.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

-- 
2.30.2
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Patch

diff --git a/drivers/usb/gadget/function/u_audio.c b/drivers/usb/gadget/function/u_audio.c
index 908e49dafd62..95605b1ef4eb 100644
--- a/drivers/usb/gadget/function/u_audio.c
+++ b/drivers/usb/gadget/function/u_audio.c
@@ -334,8 +334,6 @@  static inline void free_ep(struct uac_rtd_params *prm, struct usb_ep *ep)
 	if (!prm->ep_enabled)
 		return;
 
-	prm->ep_enabled = false;
-
 	audio_dev = uac->audio_dev;
 	params = &audio_dev->params;
 
@@ -353,11 +351,12 @@  static inline void free_ep(struct uac_rtd_params *prm, struct usb_ep *ep)
 		}
 	}
 
+	prm->ep_enabled = false;
+
 	if (usb_ep_disable(ep))
 		dev_err(uac->card->dev, "%s:%d Error!\n", __func__, __LINE__);
 }
 
-
 int u_audio_start_capture(struct g_audio *audio_dev)
 {
 	struct snd_uac_chip *uac = audio_dev->uac;