In this debugging function, copy to a buffer instead of using potentially unsafe pointers.

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@125793 65c4cc65-6c06-0410-ace0-fbb531ad65f3

include/asterisk/lock.h

@@ -186,9 +186,9 @@ void ast_remove_lock_info(void *lock_addr);
  * be preserved as to what location originally acquired the lock.
  */
 #if !defined(LOW_MEMORY)
-int ast_find_lock_info(void *lock_addr, const char **filename, int *lineno, const char **func, const char **mutex_name);
+int ast_find_lock_info(void *lock_addr, char *filename, size_t filename_size, int *lineno, char *func, size_t func_size, char *mutex_name, size_t mutex_name_size);
 #else
-#define ast_find_lock_info(a,b,c,d,e) -1
+#define ast_find_lock_info(a,b,c,d,e,f,g,h) -1
 #endif
 
 /*!
@@ -199,9 +199,9 @@ int ast_find_lock_info(void *lock_addr, const char **filename, int *lineno, cons
  */
 #define DEADLOCK_AVOIDANCE(lock) \
 	do { \
-		const char *__filename, *__func, *__mutex_name; \
+		char __filename[80], __func[80], __mutex_name[80]; \
 		int __lineno; \
-		int __res = ast_find_lock_info(lock, &__filename, &__lineno, &__func, &__mutex_name); \
+		int __res = ast_find_lock_info(lock, __filename, sizeof(__filename), &__lineno, __func, sizeof(__func), __mutex_name, sizeof(__mutex_name)); \
 		ast_mutex_unlock(lock); \
 		usleep(1); \
 		if (__res < 0) { /* Shouldn't ever happen, but just in case... */ \

main/utils.c

@@ -676,7 +676,7 @@ void ast_mark_lock_failed(void *lock_addr)
 	pthread_mutex_unlock(&lock_info->lock);
 }
 
-int ast_find_lock_info(void *lock_addr, const char **filename, int *lineno, const char **func, const char **mutex_name)
+int ast_find_lock_info(void *lock_addr, char *filename, size_t filename_size, int *lineno, char *func, size_t func_size, char *mutex_name, size_t mutex_name_size)
 {
 	struct thr_lock_info *lock_info;
 	int i = 0;
@@ -697,10 +697,10 @@ int ast_find_lock_info(void *lock_addr, const char **filename, int *lineno, cons
 		return -1;
 	}
 
-	*filename = lock_info->locks[i].file;
+	ast_copy_string(filename, lock_info->locks[i].file, filename_size);
 	*lineno = lock_info->locks[i].line_num;
-	*func = lock_info->locks[i].func;
-	*mutex_name = lock_info->locks[i].lock_name;
+	ast_copy_string(func, lock_info->locks[i].func, func_size);
+	ast_copy_string(mutex_name, lock_info->locks[i].lock_name, mutex_name_size);
 
 	pthread_mutex_unlock(&lock_info->lock);