Vulnerability CVE-2024-43856
Published: 2024-08-17

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

dma: fix call order in dmam_free_coherent

dmam_free_coherent() frees a DMA allocation, which makes the
freed vaddr available for reuse, then calls devres_destroy()
to remove and free the data structure used to track the DMA
allocation. Between the two calls, it is possible for a
concurrent task to make an allocation with the same vaddr
and add it to the devres list.

If this happens, there will be two entries in the devres list
with the same vaddr and devres_destroy() can free the wrong
entry, triggering the WARN_ON() in dmam_match.

Fix by destroying the devres entry before freeing the DMA
allocation.

kokonut //net/encryption
http://sponge2/b9145fe6-0f72-4325-ac2f-a84d81075b03

 References:
https://git.kernel.org/stable/c/f993a4baf6b622232e4c190d34c220179e5d61eb
https://git.kernel.org/stable/c/1fe97f68fce1ba24bf823bfb0eb0956003473130
https://git.kernel.org/stable/c/22094f5f52e7bc16c5bf9613365049383650b02e
https://git.kernel.org/stable/c/28e8b7406d3a1f5329a03aa25a43aa28e087cb20
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