linux-kernel - [PATCH] fix the kernel panic due to wrong use the dev memory API

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Date:   Mon, 5 Nov 2018 08:29:14 +0000
From:   "He, Bo" <bo.he@...el.com>
To:     "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     "pierre-louis.bossart@...ux.intel.com" 
        <pierre-louis.bossart@...ux.intel.com>,
        "liam.r.girdwood@...ux.intel.com" <liam.r.girdwood@...ux.intel.com>,
        "perex@...ex.cz" <perex@...ex.cz>,
        "tiwai@...e.com" <tiwai@...e.com>,
        "Singh, Guneshwor O" <guneshwor.o.singh@...el.com>,
        "Periyasamy, SriramX" <sriramx.periyasamy@...el.com>,
        "Kale, Sanyog R" <sanyog.r.kale@...el.com>,
        "Kesapragada, Pardha Saradhi" <pardha.saradhi.kesapragada@...el.com>,
        "kuninori.morimoto.gx@...esas.com" <kuninori.morimoto.gx@...esas.com>,
        "guruprasadx.pawse@...el.com" <guruprasadx.pawse@...el.com>,
        "Ughreja, Rakesh A" <rakesh.a.ughreja@...el.com>,
        "Prakash, Divya1" <divya1.prakash@...el.com>,
        "Diwakar, Praveen" <praveen.diwakar@...el.com>,
        "Zhang, Yanmin" <yanmin.zhang@...el.com>
Subject: [PATCH] fix the kernel panic due to wrong use the dev memory API

skl->dais is allocated with devm_kcalloc, can't free with
the krealloc. Memory allocated with devm API is automatically freed
on driver detach, Like all other devres resources.

Refer to drivers/base/devres.c devm_kmalloc for more details.

Signed-off-by: he, bo <bo.he@...el.com>
---
 sound/soc/intel/skylake/skl-pcm.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/sound/soc/intel/skylake/skl-pcm.c b/sound/soc/intel/skylake/skl-pcm.c
index 823e391..928d314 100644
--- a/sound/soc/intel/skylake/skl-pcm.c
+++ b/sound/soc/intel/skylake/skl-pcm.c
@@ -1438,7 +1438,8 @@ int skl_platform_register(struct device *dev)
 	}
 
 	if (!skl->use_tplg_pcm) {
-		dais = krealloc(skl->dais, sizeof(skl_fe_dai) +
+		devm_kfree(dev, skl->dais);
+		dais = devm_kcalloc(dev, skl->dais, sizeof(skl_fe_dai) +
 				sizeof(skl_platform_dai), GFP_KERNEL);
 		if (!dais) {
 			ret = -ENOMEM;
@@ -1472,7 +1473,5 @@ int skl_platform_unregister(struct device *dev)
 		}
 	}
 
-	kfree(skl->dais);
-
 	return 0;
 }
-- 
2.7.4