Vulnerability CVE-2021-47361
Published: 2024-05-21

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

mcb: fix error handling in mcb_alloc_bus()

There are two bugs:
1) If ida_simple_get() fails then this code calls put_device(carrier)
but we haven't yet called get_device(carrier) and probably that
leads to a use after free.
2) After device_initialize() then we need to use put_device() to
release the bus. This will free the internal resources tied to the
device and call mcb_free_bus() which will free the rest.

 References:
https://git.kernel.org/stable/c/8a558261fa57a6deefb0925ab1829f698b194aea
https://git.kernel.org/stable/c/115b07d9f47e3996430b8f2007edd9768e1f807f
https://git.kernel.org/stable/c/66f74ba9be9daf9c47fface6af3677f602774f6b
https://git.kernel.org/stable/c/7751f609eadf36b1f53712bae430019c53a16eb0
https://git.kernel.org/stable/c/91e4ad05bf18322b5921d1a6c9b603f6eb1694f0
https://git.kernel.org/stable/c/9fc198f415dee070a1de957bb5bf5921d8df3499
https://git.kernel.org/stable/c/25a1433216489de4abc889910f744e952cb6dbae
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