| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.4 36/70] ALSA: usx2y: Fix potential NULL dereference | Date | Fri, 1 May 2020 15:21:24 +0200 |
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From: Takashi Iwai <tiwai@suse.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@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 | 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;
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