[PATCH 5.12 146/173] ASoC: core: Fix Null-point-dereference in fmt_single_name()

[Greg Kroah-Hartman]

From: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx>

commit 41daf6ba594d55f201c50280ebcd430590441da1 upstream.

Check the return value of devm_kstrdup() in case of
Null-point-dereference.

Fixes: 45dd9943fce0 ("ASoC: core: remove artificial component and DAI name constraint")
Cc: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
Reported-by: Hulk Robot <hulkci@xxxxxxxxxx>
Signed-off-by: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20210524024941.159952-1-wangkefeng.wang@xxxxxxxxxx
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 sound/soc/soc-core.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -2223,6 +2223,8 @@ static char *fmt_single_name(struct devi
 		return NULL;
 
 	name = devm_kstrdup(dev, devname, GFP_KERNEL);
+	if (!name)
+		return NULL;
 
 	/* are we a "%s.%d" name (platform and SPI components) */
 	found = strstr(name, dev->driver->name);