Linux Kernel RDMA/hfi1 NULL Pointer Dereference Vulnerability

A vulnerability in the Linux kernel's RDMA/hfi1 component can lead to a NULL pointer dereference, causing a system panic. This issue occurs when the hfi1 module is loaded with the SDMA capability turned off. In such cases, a call to hfi1_write_iter() attempts to access a NULL pointer, resulting in a crash. The vulnerability has been addressed by adding a check for the SDMA setting in hfi1_write_iter(), ensuring that I/O operations are properly validated before execution.

Impact

Exploitation of this vulnerability leads to a system panic, causing a denial of service by crashing the affected system.