RDMA/ocrdma: Fix use after free in ocrdma_dealloc_ucontext_pd()

commit f2bc3af6353cb2a33dfa9d270d999d839eef54cb upstream.

In ocrdma_dealloc_ucontext_pd() uctx->cntxt_pd is assigned to the variable
pd and then after uctx->cntxt_pd is freed, the variable pd is passed to
function _ocrdma_dealloc_pd() which dereferences pd directly or through
its call to ocrdma_mbx_dealloc_pd().

Reorder the free using the variable pd.

Cc: stable@vger.kernel.org
Fixes: 21a428a019c9 ("RDMA: Handle PD allocations by IB/core")
Link: https://lore.kernel.org/r/20201230024653.1516495-1-trix@redhat.com
Signed-off-by: Tom Rix <trix@redhat.com>
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/infiniband/hw/ocrdma/ocrdma_verbs.c b/drivers/infiniband/hw/ocrdma/ocrdma_verbs.c
index 7350fe1..81a5600 100644 (file)
--- a/drivers/infiniband/hw/ocrdma/ocrdma_verbs.c
+++ b/drivers/infiniband/hw/ocrdma/ocrdma_verbs.c
@@ -434,9 +434,9 @@ static void ocrdma_dealloc_ucontext_pd(struct ocrdma_ucontext *uctx)
                pr_err("%s(%d) Freeing in use pdid=0x%x.\n",
                       __func__, dev->id, pd->id);
        }
-       kfree(uctx->cntxt_pd);
        uctx->cntxt_pd = NULL;
        _ocrdma_dealloc_pd(dev, pd);
+       kfree(pd);
 }
 
 static struct ocrdma_pd *ocrdma_get_ucontext_pd(struct ocrdma_ucontext *uctx)