Commit 54e7e48b authored by Ariel Levkovich's avatar Ariel Levkovich Committed by Doug Ledford

IB/uverbs: Fix kernel crash during MR deregistration flow

This patch fixes a crash that happens due to access to an
uninitialized DM pointer within the MR object.

The change makes sure the DM pointer in the MR object is set to
NULL during a non-DM MR creation to prevent a false indication
that this MR is related to a DM in the dereg flow.

Fixes: be934cca ("IB/uverbs: Add device memory registration ioctl support")
Reported-by: default avatarLijun Ou <oulijun@huawei.com>
Signed-off-by: default avatarAriel Levkovich <lariel@mellanox.com>
Signed-off-by: default avatarLeon Romanovsky <leonro@mellanox.com>
Signed-off-by: Doug Ledford's avatarDoug Ledford <dledford@redhat.com>
parent 5ccbf63f
......@@ -691,6 +691,7 @@ ssize_t ib_uverbs_reg_mr(struct ib_uverbs_file *file,
mr->device = pd->device;
mr->pd = pd;
mr->dm = NULL;
mr->uobject = uobj;
atomic_inc(&pd->usecnt);
mr->res.type = RDMA_RESTRACK_MR;
......
......@@ -1656,6 +1656,7 @@ struct ib_mr *ib_alloc_mr(struct ib_pd *pd,
if (!IS_ERR(mr)) {
mr->device = pd->device;
mr->pd = pd;
mr->dm = NULL;
mr->uobject = NULL;
atomic_inc(&pd->usecnt);
mr->need_inval = false;
......
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