linux-kernel - [PATCH] ASoC: soc-core: Fix null pointer dereference in soc_find

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Message-Id: <1547194442-1487-1-git-send-email-rohitkr@codeaurora.org>
Date:   Fri, 11 Jan 2019 13:44:02 +0530
From:   Rohit kumar <rohitkr@...eaurora.org>
To:     plai@...eaurora.org, bgoswami@...eaurora.org,
        asishb@...eaurora.org, lgirdwood@...il.com, broonie@...nel.org,
        perex@...ex.cz, tiwai@...e.com, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org, rohkumar@....qualcomm.com,
        srinivas.kandagatla@...aro.org, vinod.koul@...aro.org
Cc:     Ajit Pandey <ajitp@...eaurora.org>,
        Rohit kumar <rohitkr@...eaurora.org>
Subject: [PATCH] ASoC: soc-core: Fix null pointer dereference in soc_find_component

From: Ajit Pandey <ajitp@...eaurora.org>

soc_find_component() may lead to null pointer exception if both
arguments i.e of_node and name is NULL. Add NULL check before
calling soc_find_component(). Also fix some typos.

Fixes: 8780cf1142a5 ("ASoC: soc-core: defer card probe until all component is added to list")
Reported-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
Signed-off-by: Ajit Pandey <ajitp@...eaurora.org>
Signed-off-by: Rohit kumar <rohitkr@...eaurora.org>
---
 sound/soc/soc-core.c | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index 0934b36..df05fb8 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -1131,11 +1131,13 @@ static int soc_init_dai_link(struct snd_soc_card *card,
 	}
 
 	/*
-	 * Defer card registartion if platform dai component is not added to
+	 * Defer card registration if platform dai component is not added to
 	 * component list.
 	 */
-	if (!soc_find_component(link->platform->of_node, link->platform->name))
-		return -EPROBE_DEFER;
+	if (link->platform->of_node || link->platform->name)
+		if (!soc_find_component(link->platform->of_node,
+					link->platform->name))
+			return -EPROBE_DEFER;
 
 	/*
 	 * CPU device may be specified by either name or OF node, but
@@ -1150,11 +1152,12 @@ static int soc_init_dai_link(struct snd_soc_card *card,
 	}
 
 	/*
-	 * Defer card registartion if cpu dai component is not added to
+	 * Defer card registration if cpu dai component is not added to
 	 * component list.
 	 */
-	if (!soc_find_component(link->cpu_of_node, link->cpu_name))
-		return -EPROBE_DEFER;
+	if (link->cpu_of_node || link->cpu_name)
+		if (!soc_find_component(link->cpu_of_node, link->cpu_name))
+			return -EPROBE_DEFER;
 
 	/*
 	 * At least one of CPU DAI name or CPU device name/node must be
-- 
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is a member of Code Aurora Forum, a Linux Foundation Collaborative Project.