CVE-2024-56756: nvme-pci: fix freeing of the HMB descriptor table

First published: Sun Dec 29 2024(Updated: )

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.

Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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