From: Jerome Brunet <jbrunet@xxxxxxxxxxxx>
[ 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@xxxxxxxxxxxxxxx>
Reported-by: Thinh Nguyen <Thinh.Nguyen@xxxxxxxxxxxx>
Signed-off-by: Jerome Brunet <jbrunet@xxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20210827092927.366482-1-jbrunet@xxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/usb/gadget/function/u_audio.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/drivers/usb/gadget/function/u_audio.c b/drivers/usb/gadget/function/u_audio.c
index 5fbceee897a3..3b613ca06ae5 100644
--- a/drivers/usb/gadget/function/u_audio.c
+++ b/drivers/usb/gadget/function/u_audio.c
@@ -312,8 +312,6 @@ 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;
@@ -331,11 +329,12 @@ 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;
--
2.30.2
