[PATCH AUTOSEL 4.20 17/77] ASoC: core: Make snd_soc_find_component() more robust

Sasha Levin
2019-02-15T02:42:06Z

From: Mark Brown <broonie@kernel.org>

[ Upstream commit 5a7b2aabc1aa0393f067d9325ada96fdf67f8cb7 ]

There are some use cases where you're checking for a lot of things on a
card and it makes sense that you might end up trying to call
snd_soc_find_component() without either a name or an of_node. Currently
in that case we try to dereference the name and crash but it's more
useful to allow the caller to just treat that as a case where we don't
find anything, that error handling will already exist.

Inspired by a patch from Ajit Pandey fixing some callers.

Fixes: 8780cf1142a5 ("ASoC: soc-core: defer card probe until all component is added to list")
Reported-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
sound/soc/soc-core.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index 17632da21ba7..e4da6656f65f 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -742,7 +742,7 @@ static struct snd_soc_component *soc_find_component(
if (of_node) {
if (component->dev->of_node == of_node)
return component;
- } else if (strcmp(component->name, name) == 0) {
+ } else if (name && strcmp(component->name, name) == 0) {
return component;
}
}
--
2.19.1