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Fix potential double free when unloading a module.

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Merged revisions 378092 from http://svn.asterisk.org/svn/asterisk/branches/1.8
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Merged revisions 378093 from http://svn.asterisk.org/svn/asterisk/branches/10
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Merged revisions 378094 from http://svn.asterisk.org/svn/asterisk/branches/11


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@378095 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Richard Mudgett
2012-12-17 23:10:42 +00:00
parent 23b94b9211
commit 5e2c52a546
1 changed files with 24 additions and 4 deletions
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28
main/loader.c
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@@ -237,9 +237,18 @@ void __ast_module_user_remove(struct ast_module *mod, struct ast_module_user *u)
if (!u) {
return;
}
AST_LIST_LOCK(&mod->users);
AST_LIST_REMOVE(&mod->users, u, entry);
u = AST_LIST_REMOVE(&mod->users, u, entry);
AST_LIST_UNLOCK(&mod->users);
if (!u) {
/*
* Was not in the list. Either a bad pointer or
* __ast_module_user_hangup_all() has been called.
*/
return;
}
ast_atomic_fetchadd_int(&mod->usecount, -1);
ast_free(u);
@@ -559,15 +568,26 @@ int ast_unload_resource(const char *resource_name, enum ast_module_unload_mode f
}
if (!error) {
/* Request any channels attached to the module to hangup. */
__ast_module_user_hangup_all(mod);
res = mod->info->unload();
res = mod->info->unload();
if (res) {
ast_log(LOG_WARNING, "Firm unload failed for %s\n", resource_name);
if (force <= AST_FORCE_FIRM)
if (force <= AST_FORCE_FIRM) {
error = 1;
else
} else {
ast_log(LOG_WARNING, "** Dangerous **: Unloading resource anyway, at user request\n");
}
}
if (!error) {
/*
* Request hangup on any channels that managed to get attached
* while we called the module unload function.
*/
__ast_module_user_hangup_all(mod);
sched_yield();
}
}