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ALSA: usx2y: Fix potential NULL dereference
author
Takashi Iwai
<tiwai@suse.de>
Mon, 20 Apr 2020 07:55:29 +0000
(09:55 +0200)
committer
Greg Kroah-Hartman
<gregkh@linuxfoundation.org>
Sat, 2 May 2020 15:24:22 +0000
(17:24 +0200)
commit
7686e3485253635c529cdd5f416fc640abaf076f
upstream.
The error handling code in usX2Y_rate_set() may hit a potential NULL
dereference when an error occurs before allocating all us->urb[].
Add a proper NULL check for fixing the corner case.
Reported-by: Lin Yi <teroincn@gmail.com>
Cc: <stable@vger.kernel.org>
Link:
https://lore.kernel.org/r/20200420075529.27203-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
sound/usb/usx2y/usbusx2yaudio.c
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diff --git
a/sound/usb/usx2y/usbusx2yaudio.c
b/sound/usb/usx2y/usbusx2yaudio.c
index f93b355756e6027e694257c0e2ab829767c7be98..2dfc0abf2e37310e6df192cedced4db0e94494e4 100644
(file)
--- a/
sound/usb/usx2y/usbusx2yaudio.c
+++ b/
sound/usb/usx2y/usbusx2yaudio.c
@@
-689,6
+689,8
@@
static int usX2Y_rate_set(struct usX2Ydev *usX2Y, int rate)
us->submitted = 2*NOOF_SETRATE_URBS;
for (i = 0; i < NOOF_SETRATE_URBS; ++i) {
struct urb *urb = us->urb[i];
+ if (!urb)
+ continue;
if (urb->status) {
if (!err)
err = -ENODEV;