IB/mlx4: Fix an error handling path in 'mlx4_ib_rereg_user_mr()'

BugLink: https://bugs.launchpad.net/bugs/1835845
[ Upstream commit 3dc7c7badb7502ec3e3aa817a8bdd9e53aa54c52 ]

Before returning -EPERM we should release some resources, as already done
in the other error handling path of the function.

Fixes: d8f9cc328c88 ("IB/mlx4: Mark user MR as writable if actual virtual memory is writable")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>

diff --git a/drivers/infiniband/hw/mlx4/mr.c b/drivers/infiniband/hw/mlx4/mr.c
index 2eec24fbb0b089634cd0c60609c4557877daf0bb..98e921ea03863e84636147518ac9c41e627b6916 100644 (file)
--- a/drivers/infiniband/hw/mlx4/mr.c
+++ b/drivers/infiniband/hw/mlx4/mr.c
@@ -483,8 +483,11 @@ int mlx4_ib_rereg_user_mr(struct ib_mr *mr, int flags,
        }
 
        if (flags & IB_MR_REREG_ACCESS) {
-               if (ib_access_writable(mr_access_flags) && !mmr->umem->writable)
-                       return -EPERM;
+               if (ib_access_writable(mr_access_flags) &&
+                   !mmr->umem->writable) {
+                       err = -EPERM;
+                       goto release_mpt_entry;
+               }
 
                err = mlx4_mr_hw_change_access(dev->dev, *pmpt_entry,
                                               convert_access(mr_access_flags));