CVE-2022-49492 Information

Description

In the Linux kernel the following vulnerability has been resolved:

nvme-pci: fix a NULL pointer dereference in nvme_alloc_admin_tags

In nvme_alloc_admin_tags the admin_q can be set to an error (typically -ENOMEM) if the blk_mq_init_queue call fails to set up the queue which is checked immediately after the call. However when we return the error message up the stack to nvme_reset_work the error takes us to nvme_remove_dead_ctrl() nvme_dev_disable() nvme_suspend_queue(&dev->queues[0]).

Here we only check that the admin_q is non-NULL rather than not an error or NULL and begin quiescing a queue that never existed leading to bad / NULL pointer dereference.

Reference

https://git.kernel.org/stable/c/54a4c1e47d1b2585e74920399455bd9abbfb2bd7 https://git.kernel.org/stable/c/7a28556082d1fbcbc599baf1c24252dfc73efefc https://git.kernel.org/stable/c/8321b17789f614414206af07e17ce4751c95dc76 https://git.kernel.org/stable/c/8da2b7bdb47e94bbc4062a3978c708926bcb022c https://git.kernel.org/stable/c/906c81dba8ee8057523859b5e1a2479e9fd34860 https://git.kernel.org/stable/c/9e649471b396fa0139d53919354ce1eace9b9a24 https://git.kernel.org/stable/c/af98940dd33c9f9e1beb4f71c0a39260100e2a65 https://git.kernel.org/stable/c/da42761181627e9bdc37d18368b827948a583929 https://git.kernel.org/stable/c/f76729662650cd7bc8f8194e057af381370349a7