kunit/overflow: Fix UB in overflow_allocation_test

commit 92e9bac18124682c4b99ede9ee3bcdd68f121e92 upstream.

The 'device_name' array doesn't exist out of the
'overflow_allocation_test' function scope. However, it is being used as
a driver name when calling 'kunit_driver_create' from
'kunit_device_register'. It produces the kernel panic with KASAN
enabled.

Since this variable is used in one place only, remove it and pass the
device name into kunit_device_register directly as an ascii string.

Signed-off-by: Ivan Orlov <ivan.orlov0322@gmail.com>
Reviewed-by: David Gow <davidgow@google.com>
Link: https://lore.kernel.org/r/20240815000431.401869-1-ivan.orlov0322@gmail.com
Signed-off-by: Kees Cook <kees@kernel.org>
Signed-off-by: Jianqi Ren <jianqi.ren.cn@windriver.com>
Signed-off-by: He Zhe <zhe.he@windriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/lib/overflow_kunit.c b/lib/overflow_kunit.c
index 34db0b3aa502346bcc3bb339c19c06bf128e035c..9493a1b28b9e746e09f949a00d6889e39516420b 100644 (file)
--- a/lib/overflow_kunit.c
+++ b/lib/overflow_kunit.c
@@ -608,7 +608,6 @@ DEFINE_TEST_ALLOC(devm_kzalloc,  devm_kfree, 1, 1, 0);
 
 static void overflow_allocation_test(struct kunit *test)
 {
-       const char device_name[] = "overflow-test";
        struct device *dev;
        int count = 0;
 
@@ -618,7 +617,7 @@ static void overflow_allocation_test(struct kunit *test)
 } while (0)
 
        /* Create dummy device for devm_kmalloc()-family tests. */
-       dev = root_device_register(device_name);
+       dev = root_device_register("overflow-test");
        KUNIT_ASSERT_FALSE_MSG(test, IS_ERR(dev),
                               "Cannot register test device\n");