In the Linux kernel, the following vulnerability has been resolved:

RDMA/hfi1: Prevent panic when SDMA is disabled

If the hfi1 module is loaded with HFI1_CAP_SDMA off, a call to
hfi1_write_iter() will dereference a NULL pointer and panic. A typical
stack frame is:

  sdma_select_user_engine [hfi1]
  hfi1_user_sdma_process_request [hfi1]
  hfi1_write_iter [hfi1]
  do_iter_readv_writev
  do_iter_write
  vfs_writev
  do_writev
  do_syscall_64

The fix is to test for SDMA in hfi1_write_iter() and fail the I/O with
EINVAL.

https://git.kernel.org/stable/c/0e4dda8b3f4c07ee9ea670a10ea3171a5e63a86f

https://git.kernel.org/stable/c/22e7e400fd1a890db2ea13686324aff50e972f4f

https://git.kernel.org/stable/c/29952ab85d6c3fe0b7909d9a737f10c58bf6824d

https://git.kernel.org/stable/c/32e6aea33944f364d51cd263e4cd236393a188b6

https://git.kernel.org/stable/c/33794e8e9bcb4affc0ebff9cdec85acc8b8a1762

https://git.kernel.org/stable/c/629e052d0c98e46dde9f0824f0aa437f678d9b8f

https://git.kernel.org/stable/c/cc80d3c37cec9d6ddb140483647901bc7cc6c31d

https://git.kernel.org/stable/c/e60ad83f645ee6fadd5a8057ba267aeec54f08fe