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

null_blk: fix validation of block size

Block size should be between 512 and PAGE_SIZE and be a power of 2. The current
check does not validate this, so update the check.

Without this patch, null_blk would Oops due to a null pointer deref when
loaded with bs=1536 [1].

[axboe: remove unnecessary braces and != 0 check]

References

• https://nvd.nist.gov/vuln/detail/CVE-2024-41077
• https://git.kernel.org/stable/c/08f03186b96e25e3154916a2e70732557c770ea7
• https://git.kernel.org/stable/c/2772ed2fc075eef7df3789906fc9dae01e4e132e
• https://git.kernel.org/stable/c/9625afe1dd4a158a14bb50f81af9e2dac634c0b1
• https://git.kernel.org/stable/c/9b873bdaae64bddade9d8c6df23c8a31948d47d0
• https://git.kernel.org/stable/c/c462ecd659b5fce731f1d592285832fd6ad54053
• https://git.kernel.org/stable/c/f92409a9da02f27d05d713bff5f865e386cef9b3