Re: [PATCH RESEND] ext4: Fix potential NULL pointer dereferences in test_mb_mark_used() and test_mb_free_blocks()

On Thu, Mar 13, 2025 at 12:00:21AM +0000, Qasim Ijaz wrote:

test_mb_mark_used() and test_mb_free_blocks() call kunit_kzalloc() to allocate memory, however both fail to ensure that the allocations succeeded. If kunit_kzalloc() returns NULL, then dereferencing the corresponding pointer without checking for NULL will lead to a NULL pointer dereference.

To fix this call KUNIT_ASSERT_NOT_ERR_OR_NULL() to ensure the allocation succeeded.

Thanks; other folks have sent this fix.

- Ted