drivers/md/md-bitmap: check the return value of md_bitmap_get_counter()

CVE-2022-50402

What is CVE-2022-50402?

In the Linux kernel, the following vulnerability has been resolved:

drivers/md/md-bitmap: check the return value of md_bitmap_get_counter()

Check the return value of md_bitmap_get_counter() in case it returns NULL pointer, which will result in a null pointer dereference.

v2: update the check to include other dereference

References