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ucm: macro - add deep call protection (recursion)

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Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Jaroslav Kysela 2022-05-17 19:25:20 +02:00
parent 80ac6f9866
commit 55340cf96a
2 changed files with 7 additions and 0 deletions
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6
src/ucm/parser.c
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@ -575,7 +575,13 @@ int uc_mgr_evaluate_inplace(snd_use_case_mgr_t *uc_mgr,
/* conditions may depend on them */ /* conditions may depend on them */
if (err2 == 0) if (err2 == 0)
continue; continue;
uc_mgr->macro_hops++;
if (uc_mgr->macro_hops > 100) {
uc_error("Maximal macro hops reached!");
return -EINVAL;
}
err3 = evaluate_macro(uc_mgr, cfg); err3 = evaluate_macro(uc_mgr, cfg);
uc_mgr->macro_hops--;
if (err3 < 0) if (err3 < 0)
return err3; return err3;
if (err3 == 0) if (err3 == 0)

1
src/ucm/ucm_local.h
View file

@ -264,6 +264,7 @@ struct snd_use_case_mgr {
/* tree with macros */ /* tree with macros */
snd_config_t *macros; snd_config_t *macros;
int macro_hops;
/* local library configuration */ /* local library configuration */
snd_config_t *local_config; snd_config_t *local_config;