CVE-2022-49208 Information

Description

In the Linux kernel the following vulnerability has been resolved:

RDMA/irdma: Prevent some integer underflows

My static checker complains that:

drivers/infiniband/hw/irdma/ctrl.c:3605 irdma_sc_ceq_init()
warn: can subtract underflow 'info->dev->hmc_fpm_misc.max_ceqs'?

It appears that \info->dev->hmc_fpm_misc.max_ceqs\ comes from the firmware in irdma_sc_parse_fpm_query_buf() so yes there is a chance that it could be zero. Even if we trust the firmware it’s easy enough to change the condition just as a hardenning measure.

Reference

https://git.kernel.org/stable/c/6f6dbb819dfc1a35bcb8b709b5c83a3ea8beff75 https://git.kernel.org/stable/c/7340c3675d7ac946f4019b84cd7c64ed542dfe4c https://git.kernel.org/stable/c/d52dab6e03550f9c97121b0c11c0a3ed78ee76a4 https://git.kernel.org/stable/c/f21056f15bbeacab7b4b87af232f5599d1f2bff1