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impl-metadata: avoid infinite loop in cleat_items

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When we need to remove all items, copy the storage to a temporary
array and clear the storage.

When one of the callbacks would add a new item to the storage it would
operate on the new empty storage and the loop to iteratively clear
subjects would be able to complete.

Fixes #1622
This commit is contained in:
Wim Taymans 2021-09-20 15:06:05 +02:00
parent afb37dd7fc
commit 49a0250ecd
1 changed files with 18 additions and 10 deletions
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28
src/pipewire/impl-metadata.c
View file

@ -121,31 +121,31 @@ static int impl_add_listener(void *object,
return 0;
}
static struct item *find_item(struct metadata *this, uint32_t subject, const char *key)
static struct item *find_item(struct pw_array *storage, uint32_t subject, const char *key)
{
struct item *item;
pw_array_for_each(item, &this->storage) {
pw_array_for_each(item, storage) {
if (item->subject == subject && (key == NULL || spa_streq(item->key, key)))
return item;
}
return NULL;
}
static int clear_subjects(struct metadata *this, uint32_t subject)
static int clear_subjects(struct metadata *this, struct pw_array *storage, uint32_t subject)
{
struct item *item;
uint32_t removed = 0;
while (true) {
item = find_item(this, subject, NULL);
item = find_item(storage, subject, NULL);
if (item == NULL)
break;
pw_log_debug(NAME" %p: remove id:%d key:%s", this, subject, item->key);
clear_item(item);
pw_array_remove(&this->storage, item);
pw_array_remove(storage, item);
removed++;
}
if (removed > 0)
@ -157,9 +157,17 @@ static int clear_subjects(struct metadata *this, uint32_t subject)
static void clear_items(struct metadata *this)
{
struct item *item;
pw_array_consume(item, &this->storage)
clear_subjects(this, item->subject);
pw_array_reset(&this->storage);
struct pw_array tmp;
/* copy to tmp and reinitialize the storage so that the callbacks
* will operate on the new empty metadata. Otherwise, if a callbacks
* adds new metadata we just keep on emptying the metadata forever. */
tmp = this->storage;
pw_array_init(&this->storage, 4096);
pw_array_consume(item, &tmp)
clear_subjects(this, &tmp, item->subject);
pw_array_clear(&tmp);
}
static int impl_set_property(void *object,
@ -175,9 +183,9 @@ static int impl_set_property(void *object,
pw_log_debug(NAME" %p: id:%d key:%s type:%s value:%s", this, subject, key, type, value);
if (key == NULL)
return clear_subjects(this, subject);
return clear_subjects(this, &this->storage, subject);
item = find_item(this, subject, key);
item = find_item(&this->storage, subject, key);
if (value == NULL) {
if (item != NULL) {
clear_item(item);