linux-kernel - [PATCH 3.16 016/202] ALSA: cs46xx: Potential NULL dereference in probe

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Message-ID: <lsq.1556377989.787060356@decadent.org.uk>
Date:   Sat, 27 Apr 2019 16:13:09 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Dan Carpenter" <dan.carpenter@...cle.com>,
        "Takashi Iwai" <tiwai@...e.de>, "Yavuz, Tuba" <tuba@....ufl.edu>
Subject: [PATCH 3.16 016/202] ALSA: cs46xx: Potential NULL dereference in
 probe

3.16.66-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Dan Carpenter <dan.carpenter@...cle.com>

commit 1524f4e47f90b27a3ac84efbdd94c63172246a6f upstream.

The "chip->dsp_spos_instance" can be NULL on some of the ealier error
paths in snd_cs46xx_create().

Reported-by: "Yavuz, Tuba" <tuba@....ufl.edu>
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 sound/pci/cs46xx/dsp_spos.c | 3 +++
 1 file changed, 3 insertions(+)

--- a/sound/pci/cs46xx/dsp_spos.c
+++ b/sound/pci/cs46xx/dsp_spos.c
@@ -899,6 +899,9 @@ int cs46xx_dsp_proc_done (struct snd_cs4
 	struct dsp_spos_instance * ins = chip->dsp_spos_instance;
 	int i;
 
+	if (!ins)
+		return 0;
+
 	snd_info_free_entry(ins->proc_sym_info_entry);
 	ins->proc_sym_info_entry = NULL;