Re: [PATCH] RDS: RDMA: Fix the NULL-ptr deref in rds_ib_get_mr

[David Miller]

From: Avinash Repaka <avinash.repaka@xxxxxxxxxx>
Date: Tue, 24 Jul 2018 20:31:58 -0700

> Registration of a memory region(MR) through FRMR/fastreg(unlike FMR)
> needs a connection/qp. With a proxy qp, this dependency on connection
> will be removed, but that needs more infrastructure patches, which is a
> work in progress.
> 
> As an intermediate fix, the get_mr returns EOPNOTSUPP when connection
> details are not populated. The MR registration through sendmsg() will
> continue to work even with fast registration, since connection in this
> case is formed upfront.
> 
> This patch fixes the following crash:
 ...
> Reported-by: syzbot+b51c77ef956678a65834@xxxxxxxxxxxxxxxxxxxxxxxxx
> Signed-off-by: Santosh Shilimkar <santosh.shilimkar@xxxxxxxxxx>
> Signed-off-by: Avinash Repaka <avinash.repaka@xxxxxxxxxx>

Applied and queued up for -stable, thanks.