From: Florian Weimer <fweimer@redhat.com>
Date: Fri, 2 May 2025 09:39:29 +0000 (+0200)
Subject: c: Fix crash in c-typeck.cc convert_arguments with indirect calls
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5768bc24ca731943755ab937abc7617950e80037;p=thirdparty%2Fgcc.git

c: Fix crash in c-typeck.cc convert_arguments with indirect calls

gcc/c/

	PR c/120055
	* c-typeck.cc (convert_arguments): Check if fundecl is null
	before checking for builtin function declaration.

gcc/testsuite/

	* gcc.dg/Wdeprecated-non-prototype-6.c: New test.

(cherry picked from commit 02fa088f5b61fb5ddfff9e2dc0c0404450e7c6a4)
---

diff --git a/gcc/c/c-typeck.cc b/gcc/c/c-typeck.cc
index 9f1a94f98ad..b007c8ffe76 100644
--- a/gcc/c/c-typeck.cc
+++ b/gcc/c/c-typeck.cc
@@ -4343,7 +4343,7 @@ convert_arguments (location_t loc, vec<location_t> arg_loc, tree fntype,
 	}
 
       if (!typetail && parmnum == 0 && !TYPE_NO_NAMED_ARGS_STDARG_P (fntype)
-	  && !fndecl_built_in_p (fundecl))
+	  && !(fundecl && fndecl_built_in_p (fundecl)))
 	{
 	  auto_diagnostic_group d;
 	  bool warned;
diff --git a/gcc/testsuite/gcc.dg/Wdeprecated-non-prototype-6.c b/gcc/testsuite/gcc.dg/Wdeprecated-non-prototype-6.c
new file mode 100644
index 00000000000..08f2995d5b2
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/Wdeprecated-non-prototype-6.c
@@ -0,0 +1,14 @@
+/* { dg-do compile } */
+/* { dg-options "-std=gnu17 -Wdeprecated-non-prototype" } */
+
+void (*f1) ();
+void (*f2) ();
+void (*f3) (...);
+
+void
+g ()
+{
+  f1 ();
+  f2 (1); /* { dg-warning "does not allow arguments for function" } */
+  f3 (1);
+}