CVE-2024-47705

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

block: fix potential invalid pointer dereference in blk_add_partition

The blk_add_partition() function initially used a single if-condition

(IS_ERR(part)) to check for errors when adding a partition. This was

modified to handle the specific case of -ENXIO separately, allowing the

function to proceed without logging the error in this case. However,

this change unintentionally left a path where md_autodetect_dev()

could be called without confirming that part is a valid pointer.

This commit separates the error handling logic by splitting the

initial if-condition, improving code readability and handling specific

error scenarios explicitly. The function now distinguishes the general

error case from -ENXIO without altering the existing behavior of

md_autodetect_dev() calls.