nvme-pci: fix freeing of the HMB descriptor table

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: nvme-pci: fix freeing of the HMB descriptor table The HMB descriptor table is sized to the maximum number of descriptors that could be used for a given device, but __nvme_alloc_host_mem could break out of the loop earlier on memory allocation failure and end up using less descriptors than planned for, which leads to an incorrect size passed to dma_free_coherent. In practice this was not showing up because the number of descriptors tends to be low and the dma coherent allocator always allocates and frees at least a page.

References

• https://git.kernel.org/stable/c/ac22240540e0c5230d8c4138e3778420b712716a
• https://git.kernel.org/stable/c/452f9ddd12bebc04cef741e8ba3806bf0e1fd015
• https://git.kernel.org/stable/c/869cf50b9c9d1059f5223f79ef68fc0bc6210095
• https://git.kernel.org/stable/c/fb96d5cfa97a7363245b3dd523f475b04296d87b
• https://git.kernel.org/stable/c/cee3bff51a35cab1c5d842d409a7b11caefe2386
• https://git.kernel.org/stable/c/6d0f599db73b099aa724a12736369c4d4d92849d
• https://git.kernel.org/stable/c/582d9ed999b004fb1d415ecbfa86d4d8df455269
• https://git.kernel.org/stable/c/3c2fb1ca8086eb139b2a551358137525ae8e0d7a