Linux Kernel RDMA/hfi1 Lock Initialization Vulnerability

A vulnerability in the Linux kernel's RDMA/hfi1 component can lead to the use of an uninitialized lock. This issue arises if the probing of hfi1 fails before the sdma_map_lock is initialized. Consequently, the hfi1_free_devdata() function may attempt to use this uninitialized lock. When the locking correctness validator is active, this can trigger an INFO message along with a stack trace indicating a registration issue with a non-static key. The sdma_map_lock is intended for managing sdma_map memory, which is not allocated until after the lock is initialized. To avoid this vulnerability, the code should check if sdma_map is not NULL before attempting to use the lock.

Impact

Exploitation of this vulnerability can lead to improper locking behavior, potentially causing synchronization issues in the RDMA/hfi1 component.