ALSA: hda: Fix missing pointer check in hda_component_manager_init function

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: ae7abe36e352 ("ALSA: hda/realtek: Add CS35L41 support for Thinkpad laptops")
Cc: stable@vger.kernel.org
Signed-off-by: Denis Arefev <arefev@swemel.ru>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/hda/codecs/side-codecs/hda_component.c b/sound/hda/codecs/side-codecs/hda_component.c
index bcf47a301697cdf0368f5d9675fa237af2b13d28..8a2a200600a727d51d299aaf3d5a2c59ec8a2265 100644 (file)
--- a/sound/hda/codecs/side-codecs/hda_component.c
+++ b/sound/hda/codecs/side-codecs/hda_component.c
@@ -174,6 +174,10 @@ 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)) {
+                       codec_err(cdc, "Fail to add component %ld\n", PTR_ERR(match));
+                       return PTR_ERR(match);
+               }
        }
 
        ret = component_master_add_with_match(dev, ops, match);