+ kunit-overflow-fix-ub-in-overflow_allocation_test.patch added to mm-hotfixes-unstable branch

+ kunit-overflow-fix-ub-in-overflow_allocation_test.patch added to mm-hotfixes-unstable branch

[Andrew Morton]

The patch titled
     Subject: kunit/overflow: fix UB in overflow_allocation_test
has been added to the -mm mm-hotfixes-unstable branch.  Its filename is
     kunit-overflow-fix-ub-in-overflow_allocation_test.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/kunit-overflow-fix-ub-in-overflow_allocation_test.patch

This patch will later appear in the mm-hotfixes-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Ivan Orlov <ivan.orlov0322@gmail.com>
Subject: kunit/overflow: fix UB in overflow_allocation_test
Date: Thu, 15 Aug 2024 01:04:31 +0100

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.

Link: https://lkml.kernel.org/r/20240815000431.401869-1-ivan.orlov0322@gmail.com
Fixes: ca90800a91ba ("test_overflow: Add memory allocation overflow tests")
Signed-off-by: Ivan Orlov <ivan.orlov0322@gmail.com>
Tested-by: Erhard Furtner <erhard_f@mailbox.org>
Reviewed-by: David Gow <davidgow@google.com>
Cc: Kees Cook <kees@kernel.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 lib/overflow_kunit.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/lib/overflow_kunit.c~kunit-overflow-fix-ub-in-overflow_allocation_test
+++ a/lib/overflow_kunit.c
@@ -668,7 +668,6 @@ DEFINE_TEST_ALLOC(devm_kzalloc,  devm_kf
 
 static void overflow_allocation_test(struct kunit *test)
 {
-	const char device_name[] = "overflow-test";
 	struct device *dev;
 	int count = 0;
 
@@ -678,7 +677,7 @@ static void overflow_allocation_test(str
 } while (0)
 
 	/* Create dummy device for devm_kmalloc()-family tests. */
-	dev = kunit_device_register(test, device_name);
+	dev = kunit_device_register(test, "overflow-test");
 	KUNIT_ASSERT_FALSE_MSG(test, IS_ERR(dev),
 			       "Cannot register test device\n");
 
_

Patches currently in -mm which might be from ivan.orlov0322@gmail.com are

kunit-overflow-fix-ub-in-overflow_allocation_test.patch