From: Luís Ferreira <contact@lsferreira.net>
Date: Thu, 23 Sep 2021 15:54:00 +0000 (-0400)
Subject: libiberty: prevent null dereferencing on dlang_type
X-Git-Tag: basepoints/gcc-13~4448
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=b3585c0836e729bed56b9afd4292177673a25ca0;p=thirdparty%2Fgcc.git

libiberty: prevent null dereferencing on dlang_type

libiberty/
	* d-demangle.c (dlang_Type): Validate MANGLED is nonnull.

	* testsuite/d-demangle-expected: New test.
---

diff --git a/libiberty/d-demangle.c b/libiberty/d-demangle.c
index 7ded3e2a2563..3adf7b562d1b 100644
--- a/libiberty/d-demangle.c
+++ b/libiberty/d-demangle.c
@@ -875,7 +875,7 @@ dlang_type (string *decl, const char *mangled, struct dlang_info *info)
       szmods = string_length (&mods);
 
       /* Back referenced function type.  */
-      if (*mangled == 'Q')
+      if (mangled && *mangled == 'Q')
 	mangled = dlang_type_backref (decl, mangled, info, 1);
       else
 	mangled = dlang_function_type (decl, mangled, info);
diff --git a/libiberty/testsuite/d-demangle-expected b/libiberty/testsuite/d-demangle-expected
index c35185c3e1e3..799f4724b72e 100644
--- a/libiberty/testsuite/d-demangle-expected
+++ b/libiberty/testsuite/d-demangle-expected
@@ -991,11 +991,14 @@ _D88
 _D5__T1aZv
 _D5__T1aZv
 #
---format=dlang
 _D00
 _D00
 #
 --format=dlang
+_D01_D
+_D01_D
+#
+--format=dlang
 _D9223372036854775817
 _D9223372036854775817
 #