rust: Fix null deref when casting (PR 23124)

Fix a null dereference when casting a value to a unit type.

ChangeLog
2018-04-28  Dan Robertson  <danlrobertson89@gmail.com>

	PR rust/23124
	* gdb/rust-exp.y (convert_params_to_types): Ensure that the params
	pointer is not null before dereferencing it.

testsuite/ChangeLog
2018-04-28  Dan Robertson  <danlrobertson89@gmail.com>

	PR rust/23124
	* gdb.rust/expr.exp: Test that the unit type is correctly parsed
	when casting.

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 9c2264b..85f7525 100644 (file)
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,9 @@
+2018-04-28  Dan Robertson  <danlrobertson89@gmail.com>
+
+       PR rust/23124
+       * gdb/rust-exp.y (convert_params_to_types): Ensure that the params
+       pointer is not null before dereferencing it.
+
 2018-04-30  Tom Tromey  <tom@tromey.com>
 
        * darwin-nat-info.c (darwin_debug_regions_recurse): Remove use of

diff --git a/gdb/rust-exp.y b/gdb/rust-exp.y
index 56aa689..9f21498 100644 (file)
--- a/gdb/rust-exp.y
+++ b/gdb/rust-exp.y
@@ -2019,8 +2019,11 @@ convert_params_to_types (struct parser_state *state, rust_op_vector *params)
 {
   std::vector<struct type *> result;
 
-  for (const rust_op *op : *params)
-    result.push_back (convert_ast_to_type (state, op));
+  if (params != nullptr)
+    {
+      for (const rust_op *op : *params)
+        result.push_back (convert_ast_to_type (state, op));
+    }
 
   return result;
 }

diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog
index 4e48934..cb5e6d0 100644 (file)
--- a/gdb/testsuite/ChangeLog
+++ b/gdb/testsuite/ChangeLog
@@ -1,3 +1,9 @@
+2018-04-28  Dan Robertson  <danlrobertson89@gmail.com>
+
+       PR rust/23124
+       * gdb.rust/expr.exp: Test that the unit type is correctly parsed
+       when casting.
+
 2018-04-30  Tom Tromey  <tom@tromey.com>
 
        * gdb.python/py-type.exp: Check align attribute.

diff --git a/gdb/testsuite/gdb.rust/expr.exp b/gdb/testsuite/gdb.rust/expr.exp
index 0bc0630..22e6b49 100644 (file)
--- a/gdb/testsuite/gdb.rust/expr.exp
+++ b/gdb/testsuite/gdb.rust/expr.exp
@@ -133,7 +133,9 @@ gdb_test "print \[23usize; 4\]" " = \\\[23, 23, 23, 23\\\]"
 gdb_test "ptype \[23usize; 4\]" " = \\\[usize; 4\\\]"
 gdb_test "print \[mut 23usize; 4\]" " = \\\[23, 23, 23, 23\\\]"
 
-# Test a lexer corner case.
+# Test lexer corner cases.
+gdb_test "print 0x0 as *const ()" " = \\\(\\\(\\\) \\*\\\) 0x0"
+gdb_test "print 0x0 as fn(i64) -> ()" " = \\\(\\\(\\\) \\\(\\*\\\)\\\(i64\\\)\\\) 0x0"
 gdb_test "print r#" "syntax error in expression, near `#'\\."
 
 gdb_test "printf \"%d %d\\n\", 23+1, 23-1" "24 22"