From: Jerome Brunet jbrunet@baylibre.com
stable inclusion from linux-4.19.206 commit 6a600523e323e58dadc6322e21270d4ba8757685
--------------------------------
[ 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 Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- 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 0cb0c638fd131..168303f21bf45 100644 --- a/drivers/usb/gadget/function/u_audio.c +++ b/drivers/usb/gadget/function/u_audio.c @@ -349,8 +349,6 @@ 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;
@@ -368,11 +366,12 @@ 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;