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

dax/kmem: account for partial discontiguous resource upon removal

When dev_dax_kmem_probe() partially succeeds (at least one range is
mapped) but a subsequent range fails request_mem_region() or
add_memory_driver_managed(), the probe silently continues, ultimately
returning success, but with the corresponding range resource NULL'ed out.

dev_dax_kmem_remove() iterates over all dax_device ranges regardless of if
the underlying resource exists.  When remove_memory() is called later, it
returns 0 because the memory was never added which causes
dev_dax_kmem_remove() to incorrectly assume the (nonexistent) resource can
be removed and attempts cleanup on a NULL pointer.

Fix this by skipping these ranges altogether, noting that these cases are
considered success, such that the cleanup is still reached when all
actually-added ranges are successfully removed.

https://git.kernel.org/stable/c/30ea97affbcce236c57287c82dc6ef7a29c63b76

https://git.kernel.org/stable/c/598ed7393a639c7547b28ff3e14db9f1ac37c132

https://git.kernel.org/stable/c/5d3139abb9d1671fa5e42c3d6d8cb3b05479c5bb

https://git.kernel.org/stable/c/799e54c510a03a65a57627018a817838d72f35bd

https://git.kernel.org/stable/c/8aa442cfce79e2d69e72fc8e0c0864ac2971149d

https://git.kernel.org/stable/c/d47b0b8a69a13e06afafa54723f3e8c99b0c788f

https://git.kernel.org/stable/c/ef4fc53898bd6c4d0119cc6d419ebef7f2560f31

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