linux-kernel - [PATCH 4.4 36/70] ALSA: usx2y: Fix potential NULL dereference

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Date:   Fri,  1 May 2020 15:21:24 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Lin Yi <teroincn@...il.com>,
        Takashi Iwai <tiwai@...e.de>
Subject: [PATCH 4.4 36/70] ALSA: usx2y: Fix potential NULL dereference

From: Takashi Iwai <tiwai@...e.de>

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@...il.com>
Cc: <stable@...r.kernel.org>
Link: https://lore.kernel.org/r/20200420075529.27203-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 sound/usb/usx2y/usbusx2yaudio.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/sound/usb/usx2y/usbusx2yaudio.c
+++ b/sound/usb/usx2y/usbusx2yaudio.c
@@ -691,6 +691,8 @@ static int usX2Y_rate_set(struct usX2Yde
 			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;