lib/test_printf: Add test of null/invalid pointer dereference for dentry

This add some additional test cases of null/invalid pointer dereference
for dentry and file (%pd and %pD)

Link: http://lkml.kernel.org/r/[email protected]
To: Geert Uytterhoeven <[email protected]>
To: Sergey Senozhatsky <[email protected]>
To: Thomas Gleixner <[email protected]>
To: Andy Shevchenko <[email protected]>
To: Petr Mladek <[email protected]>
To: [email protected]
Cc: Kees Cook <[email protected]>
Cc: "Steven Rostedt (VMware)" <[email protected]>
Cc: Shuah Khan <[email protected]>
Cc: "Tobin C. Harding" <[email protected]>
Signed-off-by: Jia He <[email protected]>
Reviewed-by: Andy Shevchenko <[email protected]>
Reviewed-by: Sergey Senozhatsky <[email protected]>
Signed-off-by: Petr Mladek <[email protected]>

1 files changed, 7 insertions, 0 deletions

diff --git a/lib/test_printf.c b/lib/test_printf.c
index 944eb50f3862..befedffeb476 100644
--- a/lib/test_printf.c
+++ b/lib/test_printf.c
@@ -455,6 +455,13 @@ dentry(void)
 	test("foo", "%pd", &test_dentry[0]);
 	test("foo", "%pd2", &test_dentry[0]);
 
+	/* test the null/invalid pointer case for dentry */
+	test("(null)", "%pd", NULL);
+	test("(efault)", "%pd", PTR_INVALID);
+	/* test the null/invalid pointer case for file */
+	test("(null)", "%pD", NULL);
+	test("(efault)", "%pD", PTR_INVALID);
+
 	test("romeo", "%pd", &test_dentry[3]);
 	test("alfa/romeo", "%pd2", &test_dentry[3]);
 	test("bravo/alfa/romeo", "%pd3", &test_dentry[3]);