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ALSA: usb-audio: Fix potential memory leaks

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When the driver hits -ENOMEM at allocating a URB or a buffer, it
aborts and goes to the error path that releases the all previously
allocated resources.  However, when -ENOMEM hits at the middle of the
sync EP URB allocation loop, the partially allocated URBs might be
left without released, because ep->nurbs is still zero at that point.

Fix it by setting ep->nurbs at first, so that the error handler loops
over the full URB list.

Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20220930100151.19461-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2022-09-30 12:01:51 +02:00
parent 568be8aaf8
commit 6382da0828
1 changed files with 1 additions and 2 deletions
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3
sound/usb/endpoint.c
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@ -1268,6 +1268,7 @@ static int sync_ep_set_params(struct snd_usb_endpoint *ep)
if (!ep->syncbuf)
return -ENOMEM;
ep->nurbs = SYNC_URBS;
for (i = 0; i < SYNC_URBS; i++) {
struct snd_urb_ctx *u = &ep->urb[i];
u->index = i;
@ -1287,8 +1288,6 @@ static int sync_ep_set_params(struct snd_usb_endpoint *ep)
u->urb->complete = snd_complete_urb;
}
ep->nurbs = SYNC_URBS;
return 0;
out_of_memory: