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From:   Tong Zhang <ztong0001@gmail.com>
To:     Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.com>,
        Leon Romanovsky <leon@kernel.org>,
        Tong Zhang <ztong0001@gmail.com>, alsa-devel@alsa-project.org,
        linux-kernel@vger.kernel.org
Subject: [PATCH v1] ALSA: vx222: fix null-ptr-deref
Date:   Mon,  6 Sep 2021 18:47:45 -0700
Message-Id: <20210907014746.1445278-1-ztong0001@gmail.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

a recent refactor created a null pointer vx in snd_vx222_probe().
The vx pointer should have been populated in snd_vx222_create() as
suggested in earlier version, otherwise vx->core.ibl.size will throw an
error.

[    1.298398] BUG: kernel NULL pointer dereference, address: 00000000000001d8
[    1.316799] RIP: 0010:snd_vx222_probe+0x155/0x290 [snd_vx222]

Fixes: 3bde3359aa16 ("ALSA: vx222: Allocate resources with device-managed APIs")
Signed-off-by: Tong Zhang <ztong0001@gmail.com>
---
 sound/pci/vx222/vx222.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/sound/pci/vx222/vx222.c b/sound/pci/vx222/vx222.c
index f48cc20b9e8a..468a6a20dc1e 100644
--- a/sound/pci/vx222/vx222.c
+++ b/sound/pci/vx222/vx222.c
@@ -137,6 +137,7 @@ static int snd_vx222_create(struct snd_card *card, struct pci_dev *pci,
 	}
 	chip->irq = pci->irq;
 	card->sync_irq = chip->irq;
+	*rchip = vx;
 
 	return 0;
 }
-- 
2.25.1