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usb: gadget: u_audio: fix race condition on endpoint stop

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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: 7de8681be2 ("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>
This commit is contained in:
Jerome Brunet 2021-08-27 11:29:27 +02:00 committed by Greg Kroah-Hartman
parent 75432ba583
commit 068fdad204
1 changed files with 4 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/usb/gadget/function/u_audio.c
View File

@ -394,8 +394,6 @@ 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;
@ -413,6 +411,8 @@ 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__);
}
@ -424,8 +424,6 @@ static inline void free_ep_fback(struct uac_rtd_params *prm, struct usb_ep *ep)
if (!prm->fb_ep_enabled)
return;
prm->fb_ep_enabled = false;
if (prm->req_fback) {
if (usb_ep_dequeue(ep, prm->req_fback)) {
kfree(prm->req_fback->buf);
@ -434,6 +432,8 @@ static inline void free_ep_fback(struct uac_rtd_params *prm, struct usb_ep *ep)
prm->req_fback = NULL;
}
prm->fb_ep_enabled = false;
if (usb_ep_disable(ep))
dev_err(uac->card->dev, "%s:%d Error!\n", __func__, __LINE__);
}