[PATCH] ALSA: hda: Fix missing pointer check in hda_component_manager_init function

[Denis Arefev]

The __component_match_add function may assign the 'matchptr' pointer
the value ERR_PTR(-ENOMEM), which will subsequently be dereferenced.

The call stack leading to the error looks like this: 

hda_component_manager_init
|-> component_match_add
    |-> component_match_add_release
        |-> __component_match_add ( ... ,**matchptr, ... )
            |-> *matchptr = ERR_PTR(-ENOMEM);       // assign 
|-> component_master_add_with_match( ...  match)
    |-> component_match_realloc(match, match->num); // dereference

Add IS_ERR() check to prevent the crash.

Found by Linux Verification Center (linuxtesting.org) with SVACE.          

Fixes: fd895a74dc1d ("ALSA: hda: realtek: Move hda_component implementation to module")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Denis Arefev <arefev@xxxxxxxxx>
---
 sound/hda/codecs/side-codecs/hda_component.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sound/hda/codecs/side-codecs/hda_component.c b/sound/hda/codecs/side-codecs/hda_component.c
index 71860e2d6377..84ddbab660e3 100644
--- a/sound/hda/codecs/side-codecs/hda_component.c
+++ b/sound/hda/codecs/side-codecs/hda_component.c
@@ -181,6 +181,8 @@ int hda_component_manager_init(struct hda_codec *cdc,
 		sm->match_str = match_str;
 		sm->index = i;
 		component_match_add(dev, &match, hda_comp_match_dev_name, sm);
+		if (IS_ERR(match))
+			return PTR_ERR(match);
 	}
 
 	ret = component_master_add_with_match(dev, ops, match);
-- 
2.43.0