[PATCH] ALSA: Fix uninintialized error return

[PATCH] ALSA: Fix uninintialized error return

[Colin King]

From: Colin Ian King <colin.king@canonical.com>

Static analysis with cppcheck found the following error:
  [sound/core/init.c:118]: (error) Uninitialized variable: err

..this was introduced by commit 2471b6c80a70e80de69f5ff4c37187c3912e5874
("ALSA: info: Register proc entries recursively, too") where the call
to snd_info_card_register was removed and no longer setting the error
return in err.  When snd_info_create_card_entry fails to allocate a
an entry, the error path exits with garbage in err.  Fix is to return
-ENOMEM if entry fails to be allocated.

Author: Takashi Iwai <tiwai@suse.de>
Date:   Mon May 18 09:20:24 2015 +0200

Fixes: 2471b6c80a ("ALSA: info: Register proc entries recursively, too")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
---
 sound/core/init.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/sound/core/init.c b/sound/core/init.c
index 3e0ceba..20f37fb 100644
--- a/sound/core/init.c
+++ b/sound/core/init.c
@@ -109,13 +109,12 @@ static void snd_card_id_read(struct snd_info_entry *entry,
 
 static int init_info_for_card(struct snd_card *card)
 {
-	int err;
 	struct snd_info_entry *entry;
 
 	entry = snd_info_create_card_entry(card, "id", card->proc_root);
 	if (!entry) {
 		dev_dbg(card->dev, "unable to create card entry\n");
-		return err;
+		return -ENOMEM;
 	}
 	entry->c.text.read = snd_card_id_read;
 	card->proc_id = entry;
-- 
2.1.4

Re: [PATCH] ALSA: Fix uninintialized error return

[Takashi Iwai]

At Mon, 29 Jun 2015 17:10:22 +0100,
Colin King wrote:
> 
> From: Colin Ian King <colin.king@canonical.com>
> 
> Static analysis with cppcheck found the following error:
>   [sound/core/init.c:118]: (error) Uninitialized variable: err
> 
> ..this was introduced by commit 2471b6c80a70e80de69f5ff4c37187c3912e5874
> ("ALSA: info: Register proc entries recursively, too") where the call
> to snd_info_card_register was removed and no longer setting the error
> return in err.  When snd_info_create_card_entry fails to allocate a
> an entry, the error path exits with garbage in err.  Fix is to return
> -ENOMEM if entry fails to be allocated.
> 
> Author: Takashi Iwai <tiwai@suse.de>
> Date:   Mon May 18 09:20:24 2015 +0200

These two lines seem superfluous.  I removed them and applied the
patch now.  Thanks.


Takashi

> 
> Fixes: 2471b6c80a ("ALSA: info: Register proc entries recursively, too")
> Signed-off-by: Colin Ian King <colin.king@canonical.com>
> ---
>  sound/core/init.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/sound/core/init.c b/sound/core/init.c
> index 3e0ceba..20f37fb 100644
> --- a/sound/core/init.c
> +++ b/sound/core/init.c
> @@ -109,13 +109,12 @@ static void snd_card_id_read(struct snd_info_entry *entry,
>  
>  static int init_info_for_card(struct snd_card *card)
>  {
> -	int err;
>  	struct snd_info_entry *entry;
>  
>  	entry = snd_info_create_card_entry(card, "id", card->proc_root);
>  	if (!entry) {
>  		dev_dbg(card->dev, "unable to create card entry\n");
> -		return err;
> +		return -ENOMEM;
>  	}
>  	entry->c.text.read = snd_card_id_read;
>  	card->proc_id = entry;
> -- 
> 2.1.4
> 

Re: [PATCH] ALSA: Fix uninintialized error return

[Colin Ian King]

On 29/06/15 18:10, Takashi Iwai wrote:
> At Mon, 29 Jun 2015 17:10:22 +0100,
> Colin King wrote:
>>
>> From: Colin Ian King <colin.king@canonical.com>
>>
>> Static analysis with cppcheck found the following error:
>>   [sound/core/init.c:118]: (error) Uninitialized variable: err
>>
>> ..this was introduced by commit 2471b6c80a70e80de69f5ff4c37187c3912e5874
>> ("ALSA: info: Register proc entries recursively, too") where the call
>> to snd_info_card_register was removed and no longer setting the error
>> return in err.  When snd_info_create_card_entry fails to allocate a
>> an entry, the error path exits with garbage in err.  Fix is to return
>> -ENOMEM if entry fails to be allocated.
>>
>> Author: Takashi Iwai <tiwai@suse.de>
>> Date:   Mon May 18 09:20:24 2015 +0200
> 
> These two lines seem superfluous.  I removed them and applied the
> patch now.  Thanks.
> 
Thanks, somehow I missed that cut-n-paste mistake.

> 
> Takashi
> 
>>
>> Fixes: 2471b6c80a ("ALSA: info: Register proc entries recursively, too")
>> Signed-off-by: Colin Ian King <colin.king@canonical.com>
>> ---
>>  sound/core/init.c | 3 +--
>>  1 file changed, 1 insertion(+), 2 deletions(-)
>>
>> diff --git a/sound/core/init.c b/sound/core/init.c
>> index 3e0ceba..20f37fb 100644
>> --- a/sound/core/init.c
>> +++ b/sound/core/init.c
>> @@ -109,13 +109,12 @@ static void snd_card_id_read(struct snd_info_entry *entry,
>>  
>>  static int init_info_for_card(struct snd_card *card)
>>  {
>> -	int err;
>>  	struct snd_info_entry *entry;
>>  
>>  	entry = snd_info_create_card_entry(card, "id", card->proc_root);
>>  	if (!entry) {
>>  		dev_dbg(card->dev, "unable to create card entry\n");
>> -		return err;
>> +		return -ENOMEM;
>>  	}
>>  	entry->c.text.read = snd_card_id_read;
>>  	card->proc_id = entry;
>> -- 
>> 2.1.4
>>