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Merge "res_pjsip_pubsub.c: Fix body generator registration race." into 13

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This commit is contained in:
zuul
2016-04-29 13:06:27 -05:00
committed by Gerrit Code Review
parent 72ee8c1bf9 f9e416f053
commit 3e5666eadc
1 changed files with 22 additions and 14 deletions
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36
res/res_pjsip_pubsub.c
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@@ -2541,20 +2541,28 @@ void ast_sip_unregister_subscription_handler(struct ast_sip_subscription_handler
AST_RWLIST_TRAVERSE_SAFE_END;
}
static struct ast_sip_pubsub_body_generator *find_body_generator_type_subtype(const char *content_type,
const char *content_subtype)
static struct ast_sip_pubsub_body_generator *find_body_generator_type_subtype_nolock(const char *type, const char *subtype)
{
struct ast_sip_pubsub_body_generator *iter;
SCOPED_LOCK(lock, &body_generators, AST_RWLIST_RDLOCK, AST_RWLIST_UNLOCK);
struct ast_sip_pubsub_body_generator *gen;
AST_LIST_TRAVERSE(&body_generators, iter, list) {
if (!strcmp(iter->type, content_type) &&
!strcmp(iter->subtype, content_subtype)) {
AST_LIST_TRAVERSE(&body_generators, gen, list) {
if (!strcmp(gen->type, type)
&& !strcmp(gen->subtype, subtype)) {
break;
}
};
}
return iter;
return gen;
}
static struct ast_sip_pubsub_body_generator *find_body_generator_type_subtype(const char *type, const char *subtype)
{
struct ast_sip_pubsub_body_generator *gen;
AST_RWLIST_RDLOCK(&body_generators);
gen = find_body_generator_type_subtype_nolock(type, subtype);
AST_RWLIST_UNLOCK(&body_generators);
return gen;
}
static struct ast_sip_pubsub_body_generator *find_body_generator_accept(const char *accept)
@@ -3092,14 +3100,14 @@ int ast_sip_pubsub_register_body_generator(struct ast_sip_pubsub_body_generator
pj_str_t accept;
pj_size_t accept_len;
existing = find_body_generator_type_subtype(generator->type, generator->subtype);
AST_RWLIST_WRLOCK(&body_generators);
existing = find_body_generator_type_subtype_nolock(generator->type, generator->subtype);
if (existing) {
ast_log(LOG_WARNING, "Cannot register body generator of %s/%s."
"One is already registered.\n", generator->type, generator->subtype);
AST_RWLIST_UNLOCK(&body_generators);
ast_log(LOG_WARNING, "A body generator for %s/%s is already registered.\n",
generator->type, generator->subtype);
return -1;
}
AST_RWLIST_WRLOCK(&body_generators);
AST_LIST_INSERT_HEAD(&body_generators, generator, list);
AST_RWLIST_UNLOCK(&body_generators);