ASoC: soc-core: snd_soc_rtdcom_lookup() cares component driver name

Web:        https://git.kernel.org/torvalds/c/971da24c48a9447fb7a3c7805812fd5f443ca008
Commit:     971da24c48a9447fb7a3c7805812fd5f443ca008
Parent:     031734b7d6532633d0cde73475c30646bf37cd6d
Refname:    refs/heads/master
Author:     Kuninori Morimoto <[email protected]>
AuthorDate: Tue Jan 23 00:41:24 2018 +0000
Committer:  Mark Brown <[email protected]>
CommitDate: Tue Jan 23 11:17:56 2018 +0000

    ASoC: soc-core: snd_soc_rtdcom_lookup() cares component driver name
    
    snd_soc_rtdcom_lookup() look up component by uisng driver name.
    Then, it uses component->driver->name.
    Some driver might doesn't have it, thus it should care NULL pointer.
    This patch solve this issue.
    
    Reported-by: Mukunda,Vijendar <[email protected]>
    Reported-by: Manuel Lauss <[email protected]>
    Signed-off-by: Kuninori Morimoto <[email protected]>
    Tested-by: Mukunda,Vijendar <[email protected]>
    Signed-off-by: Mark Brown <[email protected]>
---
 sound/soc/soc-core.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index 9b79c2199781..52b2e04cc5e2 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -590,9 +590,17 @@ struct snd_soc_component *snd_soc_rtdcom_lookup(struct snd_soc_pcm_runtime *rtd,
 {
 	struct snd_soc_rtdcom_list *rtdcom;
 
+	if (!driver_name)
+		return NULL;
+
 	for_each_rtdcom(rtd, rtdcom) {
-		if ((rtdcom->component->driver->name == driver_name) ||
-		    strcmp(rtdcom->component->driver->name, driver_name) == 0)
+		const char *component_name = rtdcom->component->driver->name;
+
+		if (!component_name)
+			continue;
+
+		if ((component_name == driver_name) ||
+		    strcmp(component_name, driver_name) == 0)
 			return rtdcom->component;
 	}
 
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