linux-kernel - [PATCH 4.14 217/228] ALSA: echoaudio: Fix potential Oops in snd_echo

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Message-Id: <20200820091618.357427131@linuxfoundation.org>
Date:   Thu, 20 Aug 2020 11:23:12 +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, Dinghao Liu <dinghao.liu@....edu.cn>,
        Takashi Iwai <tiwai@...e.de>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.14 217/228] ALSA: echoaudio: Fix potential Oops in snd_echo_resume()

From: Dinghao Liu <dinghao.liu@....edu.cn>

[ Upstream commit 5a25de6df789cc805a9b8ba7ab5deef5067af47e ]

Freeing chip on error may lead to an Oops at the next time
the system goes to resume. Fix this by removing all
snd_echo_free() calls on error.

Fixes: 47b5d028fdce8 ("ALSA: Echoaudio - Add suspend support #2")
Signed-off-by: Dinghao Liu <dinghao.liu@....edu.cn>
Link: https://lore.kernel.org/r/20200813074632.17022-1-dinghao.liu@zju.edu.cn
Signed-off-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 sound/pci/echoaudio/echoaudio.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/sound/pci/echoaudio/echoaudio.c b/sound/pci/echoaudio/echoaudio.c
index e1f0bcd45c378..b58a098a7270d 100644
--- a/sound/pci/echoaudio/echoaudio.c
+++ b/sound/pci/echoaudio/echoaudio.c
@@ -2215,7 +2215,6 @@ static int snd_echo_resume(struct device *dev)
 	if (err < 0) {
 		kfree(commpage_bak);
 		dev_err(dev, "resume init_hw err=%d\n", err);
-		snd_echo_free(chip);
 		return err;
 	}
 
@@ -2242,7 +2241,6 @@ static int snd_echo_resume(struct device *dev)
 	if (request_irq(pci->irq, snd_echo_interrupt, IRQF_SHARED,
 			KBUILD_MODNAME, chip)) {
 		dev_err(chip->card->dev, "cannot grab irq\n");
-		snd_echo_free(chip);
 		return -EBUSY;
 	}
 	chip->irq = pci->irq;
-- 
2.25.1