================
@@ -3248,6 +3248,61 @@ Loss of sign/precision in implicit conversions.
short X = A; // warn (loss of precision)
}
+.. _alpha-core-DanglingPtrDeref:
+
+alpha.core.DanglingPtrDeref (C, C++)
+""""""""""""""""""""""""""""""""""""
+Check for dereferences of pointers that refer to an object whose
+lifetime has already ended. Such a pointer is dangling. The checker
+reports it when it is dereferenced and when it is passed to a function.
+
+Each object is reported at most once on an execution path. If the same dangling
+pointer is used several times then only the first use is reported.
+
+.. code-block:: cpp
+
+ void test_deref() {
+ int *ptr = 0;
+ {
+ int num = 5;
+ ptr = #
+ } // note: 'num' is destroyed here
+ *ptr = 6; // warn: use of 'num' after its lifetime ended
+ }
+
+ void test_in_scope() {
+ int num = 5;
+ int *ptr = #
+ {
+ *ptr = 6; // no warning, 'num' is still in scope
+ }
+ }
+
+The checker requires end-of-lifetime information from the CFG. It is enabled
+with the ``-analyzer-config cfg-lifetime=true`` option.
----------------
benedekaibas wrote:
Added a cleaner explanation here:
[1158032](https://github.com/llvm/llvm-project/pull/216688/commits/1158032031ed1802324f391eaf4601aca89fbc9d)
https://github.com/llvm/llvm-project/pull/216688
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