[alsa-devel] [PATCH] alsa-lib: fixed coverity reported issues under "USE_AFTER_FREE" checker.

[Clemens Ladisch]

sudarshan.bisht at nokia.com wrote:
> --- a/src/control/control_hw.c
> +++ b/src/control/control_hw.c
> @@ -414,6 +414,7 @@ int snd_ctl_hw_open(snd_ctl_t **handle, const char *name, int card, int mode)
>  	if (err < 0) {
>  		close(fd);
>  		free(hw);
> +		hw = NULL;
>  	}

In this place, it's just a "return err" that is missing.

> --- a/src/mixer/mixer.c
> +++ b/src/mixer/mixer.c
> @@ -205,7 +205,7 @@ int snd_mixer_attach(snd_mixer_t *mixer, const char *name)
>  		return err;
>  	err = snd_mixer_attach_hctl(mixer, hctl);
>  	if (err < 0) {
> -		snd_hctl_close(hctl);
> +		/* ideally hctl should be freed here, but it's taken care in snd_mixer_attach_hctl*/	
>  		return err;
>  	}

If the calloc() in snd_mixer_attach_hctl() fails, hctl is not freed.
The bug is the inconsistent error handling cleanup in
snd_mixer_attach_hctl(); I think it shouldn't free its hctl in any case.


Regards,
Clemens