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UCM: Disallow gets of undefined system properties

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In UCM, there are various system-defined properties whose names start
with "_". Explicitly prevent any gets from falling back to properties
defined in a config file if the property name starts with "_", in order
to reserve the entire "_" namespace for system-defined properties.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Liam Girdwood <lrg@ti.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Stephen Warren 2011-06-03 14:56:32 -06:00 • committed by Takashi Iwai
parent fc038149c5
commit 547300fb35
1 changed files with 14 additions and 1 deletions
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15
src/ucm/main.c
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@ -1032,6 +1032,8 @@ int snd_use_case_get_list(snd_use_case_mgr_t *uc_mgr,
err = get_device_list(uc_mgr, list, str);
else if (check_identifier(identifier, "_modifiers"))
err = get_modifier_list(uc_mgr, list, str);
else if (identifier[0] == '_')
err = -ENOENT;
else
err = get_value_list(uc_mgr, identifier, list, str);
if (str)
@ -1159,6 +1161,9 @@ int snd_use_case_get(snd_use_case_mgr_t *uc_mgr,
goto __end;
}
err = 0;
} else if (identifier[0] == '_') {
err = -ENOENT;
goto __end;
} else {
str1 = strchr(identifier, '/');
if (str1) {
@ -1247,8 +1252,16 @@ int snd_use_case_geti(snd_use_case_mgr_t *uc_mgr,
*value = err;
err = 0;
}
#if 0
/*
* enable this block if the else clause below is expanded to query
* user-supplied values
*/
} else if (identifier[0] == '_')
err = -ENOENT;
#endif
} else
err = -EINVAL;
err = -ENOENT;
if (str)
free(str);
}