[PATCH 6.6 063/192] ALSA: hda: cs35l41: Possible null pointer dereference in cs35l41_hda_unbind()

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6.6-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Simon Trimmer <simont@xxxxxxxxxxxxxxxxxxxxx>

[ Upstream commit 6386682cdc8b41319c92fbbe421953e33a28840c ]

The cs35l41_hda_unbind() function clears the hda_component entry
matching it's index and then dereferences the codec pointer held in the
first element of the hda_component array, this is an issue when the
device index was 0.

Instead use the codec pointer stashed in the cs35l41_hda structure as it
will still be valid.

Fixes: 7cf5ce66dfda ("ALSA: hda: cs35l41: Add device_link between HDA and cs35l41_hda")
Signed-off-by: Simon Trimmer <simont@xxxxxxxxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20240531120820.35367-1-simont@xxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 sound/pci/hda/cs35l41_hda.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/pci/hda/cs35l41_hda.c b/sound/pci/hda/cs35l41_hda.c
index 3c157b006a5a2..b437beae9b516 100644
--- a/sound/pci/hda/cs35l41_hda.c
+++ b/sound/pci/hda/cs35l41_hda.c
@@ -1187,7 +1187,7 @@ static void cs35l41_hda_unbind(struct device *dev, struct device *master, void *
 	if (comps[cs35l41->index].dev == dev) {
 		memset(&comps[cs35l41->index], 0, sizeof(*comps));
 		sleep_flags = lock_system_sleep();
-		device_link_remove(&comps->codec->core.dev, cs35l41->dev);
+		device_link_remove(&cs35l41->codec->core.dev, cs35l41->dev);
 		unlock_system_sleep(sleep_flags);
 	}
 }
-- 
2.43.0







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