[PATCH v1] kunit: fix bug in KUNIT_EXPECT_MEMEQ

[Rae Moar]

In KUNIT_EXPECT_MEMEQ and KUNIT_EXPECT_MEMNEQ, add check if one of the
inputs is NULL and fail if this is the case.

Currently, the kernel crashes if one of the inputs is NULL. Instead,
fail the test and add an appropriate error message.

This was found by the kernel test robot:
https://lore.kernel.org/all/202212191448.D6EDPdOh-lkp@xxxxxxxxx/

Reported-by: kernel test robot <lkp@xxxxxxxxx>

Signed-off-by: Rae Moar <rmoar@xxxxxxxxxx>
---
 include/kunit/test.h |  7 ++++---
 lib/kunit/assert.c   | 40 +++++++++++++++++++++++++---------------
 2 files changed, 29 insertions(+), 18 deletions(-)

diff --git a/include/kunit/test.h b/include/kunit/test.h
index 87ea90576b50..3c7045e22512 100644
--- a/include/kunit/test.h
+++ b/include/kunit/test.h
@@ -683,9 +683,10 @@ do {									       \
 		.right_text = #right,					       \
 	};								       \
 									       \
-	if (likely(memcmp(__left, __right, __size) op 0))		       \
-		break;							       \
-									       \
+	if (likely(__left && __right))			   \
+		if (likely(memcmp(__left, __right, __size) op 0))	     \
+			break;							       \
+											       \
 	_KUNIT_FAILED(test,						       \
 		      assert_type,					       \
 		      kunit_mem_assert,					       \
diff --git a/lib/kunit/assert.c b/lib/kunit/assert.c
index f5b50babe38d..05a09652f5a1 100644
--- a/lib/kunit/assert.c
+++ b/lib/kunit/assert.c
@@ -241,24 +241,34 @@ void kunit_mem_assert_format(const struct kunit_assert *assert,
 	mem_assert = container_of(assert, struct kunit_mem_assert,
 				  assert);
 
-	string_stream_add(stream,
-			  KUNIT_SUBTEST_INDENT "Expected %s %s %s, but\n",
-			  mem_assert->text->left_text,
-			  mem_assert->text->operation,
-			  mem_assert->text->right_text);
+	if (!mem_assert->left_value) {
+		string_stream_add(stream,
+				  KUNIT_SUBTEST_INDENT "Expected %s is not null, but is\n",
+				  mem_assert->text->left_text);
+	} else if (!mem_assert->right_value) {
+		string_stream_add(stream,
+				  KUNIT_SUBTEST_INDENT "Expected %s is not null, but is\n",
+				  mem_assert->text->right_text);
+	} else {
+		string_stream_add(stream,
+				KUNIT_SUBTEST_INDENT "Expected %s %s %s, but\n",
+				mem_assert->text->left_text,
+				mem_assert->text->operation,
+				mem_assert->text->right_text);
 
-	string_stream_add(stream, KUNIT_SUBSUBTEST_INDENT "%s ==\n",
-			  mem_assert->text->left_text);
-	kunit_assert_hexdump(stream, mem_assert->left_value,
-			     mem_assert->right_value, mem_assert->size);
+		string_stream_add(stream, KUNIT_SUBSUBTEST_INDENT "%s ==\n",
+				mem_assert->text->left_text);
+		kunit_assert_hexdump(stream, mem_assert->left_value,
+					mem_assert->right_value, mem_assert->size);
 
-	string_stream_add(stream, "\n");
+		string_stream_add(stream, "\n");
 
-	string_stream_add(stream, KUNIT_SUBSUBTEST_INDENT "%s ==\n",
-			  mem_assert->text->right_text);
-	kunit_assert_hexdump(stream, mem_assert->right_value,
-			     mem_assert->left_value, mem_assert->size);
+		string_stream_add(stream, KUNIT_SUBSUBTEST_INDENT "%s ==\n",
+				mem_assert->text->right_text);
+		kunit_assert_hexdump(stream, mem_assert->right_value,
+					mem_assert->left_value, mem_assert->size);
 
-	kunit_assert_print_msg(message, stream);
+		kunit_assert_print_msg(message, stream);
+	}
 }
 EXPORT_SYMBOL_GPL(kunit_mem_assert_format);

base-commit: 5cb26c298ffde271d9bd1dd1b87ad028218f77fe
-- 
2.39.1.405.gd4c25cc71f-goog