[PATCH 5.11 021/601] ASoC: samsung: tm2_wm5110: check of of_parse return value

Greg Kroah-Hartman
2021-05-12T16:52:39Z

From: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>

commit d58970da324732686529655c21791cef0ee547c4 upstream.

cppcheck warning:

sound/soc/samsung/tm2_wm5110.c:605:6: style: Variable 'ret' is
reassigned a value before the old one has been
used. [redundantAssignment]
ret = devm_snd_soc_register_component(dev, &tm2_component,
^
sound/soc/samsung/tm2_wm5110.c:554:7: note: ret is assigned
ret = of_parse_phandle_with_args(dev->of_node, "i2s-controller",
^
sound/soc/samsung/tm2_wm5110.c:605:6: note: ret is overwritten
ret = devm_snd_soc_register_component(dev, &tm2_component,
^

The args is a stack variable, so it could have junk (uninitialized)
therefore args.np could have a non-NULL and random value even though
property was missing. Later could trigger invalid pointer dereference.

There's no need to check for args.np because args.np won't be
initialized on errors.

Fixes: 8d1513cef51a ("ASoC: samsung: Add support for HDMI audio on TM2 board")
Cc: <stable@vger.kernel.org>
Suggested-by: Krzysztof Kozlowski <krzk@kernel.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Reviewed-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20210312180231.2741-2-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
sound/soc/samsung/tm2_wm5110.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/sound/soc/samsung/tm2_wm5110.c
+++ b/sound/soc/samsung/tm2_wm5110.c
@@ -553,7 +553,7 @@ static int tm2_probe(struct platform_dev

ret = of_parse_phandle_with_args(dev->of_node, "i2s-controller",
cells_name, i, &args);
- if (!args.np) {
+ if (ret) {
dev_err(dev, "i2s-controller property parse error: %d\n", i);
ret = -EINVAL;
goto dai_node_put;