From: Nick Clifton <nickc@redhat.com>
Date: Thu, 21 Nov 2019 17:02:40 +0000 (+0000)
Subject: Fix potentially undefined behaviour in the linker when parsing input statements.
X-Git-Tag: binutils-2_34~722
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=b52696f9e567da157b152ae641f064507f993969;p=thirdparty%2Fbinutils-gdb.git

Fix potentially undefined behaviour in the linker when parsing input statements.

	* ldlang.h (LANG_FOR_EACH_INPUT_STATEMENT): Check for an empty
	file chain before examining the first input statement.
---

diff --git a/ld/ChangeLog b/ld/ChangeLog
index e4e3f740584..5a3b2ddd1ca 100644
--- a/ld/ChangeLog
+++ b/ld/ChangeLog
@@ -1,3 +1,8 @@
+2019-11-21  Nick Clifton  <nickc@redhat.com>
+
+	* ldlang.h (LANG_FOR_EACH_INPUT_STATEMENT): Check for an empty
+	file chain before examining the first input statement.
+
 2019-11-21  Alan Modra  <amodra@gmail.com>
 
 	PR 46
diff --git a/ld/ldlang.h b/ld/ldlang.h
index 8cc5cf7f900..3e3e6a02894 100644
--- a/ld/ldlang.h
+++ b/ld/ldlang.h
@@ -574,7 +574,7 @@ extern asection *section_for_dot
 
 #define LANG_FOR_EACH_INPUT_STATEMENT(statement)			\
   lang_input_statement_type *statement;					\
-  for (statement = &file_chain.head->input_statement;			\
+  for (statement = file_chain.head == NULL ? NULL : &file_chain.head->input_statement; \
        statement != NULL;						\
        statement = statement->next)