From fefd30867d3fa33ff7cff3fcb4d2c361d1b1d51b Mon Sep 17 00:00:00 2001
From: Martin Sebor <msebor@redhat.com>
Date: Tue, 10 Jan 2017 22:35:22 +0000
Subject: [PATCH] PR middle-end/78138 - missing warnings on buffer overflow
 with non-constant source length

gcc/testsuite/ChangeLog:

	PR middle-end/78138
	* gcc.dg/pr78138.c: New test.

From-SVN: r244297
---
 gcc/testsuite/ChangeLog        |  5 +++++
 gcc/testsuite/gcc.dg/pr78138.c | 22 ++++++++++++++++++++++
 2 files changed, 27 insertions(+)
 create mode 100644 gcc/testsuite/gcc.dg/pr78138.c

diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 6fdfcacafeb..8f5f8dfc028 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2017-01-10  Martin Sebor  <msebor@redhat.com>
+
+	PR middle-end/78138
+	* gcc.dg/pr78138.c: New test. 
+
 2017-01-10  David Malcolm  <dmalcolm@redhat.com>
 
 	PR c++/77949
diff --git a/gcc/testsuite/gcc.dg/pr78138.c b/gcc/testsuite/gcc.dg/pr78138.c
new file mode 100644
index 00000000000..ecc9ee655bc
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr78138.c
@@ -0,0 +1,22 @@
+/* PR middle-end/78138 - missing warnings on buffer overflow with non-constant
+   source length
+   { dg-do compile }
+   { dg-options "-O2 -Wformat-length" } */
+
+char d [5];
+
+void* memcpy (void*, const void*, unsigned long);
+extern char* strcpy (char*, const char*);
+
+void f (int i, int j)
+{
+  strcpy (d, j ? "12345" : "123456");   /* { dg-warning ".strcpy. writing 6 bytes into a region of size 5" } */
+}
+
+void g (void *p)
+{
+  extern unsigned n;
+  if (n < 17 || 32 < n) n = 7;
+
+  memcpy (d, p, n);   /* { dg-warning ".memcpy.: writing between 7 and 32 bytes into a region of size 5" } */
+};
-- 
2.30.2