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RDMA/irdma: Fix double free related to rereg_user_mr

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If IB_MR_REREG_TRANS is set during rereg_user_mr, the
umem will be released and a new one will be allocated
in irdma_rereg_mr_trans. If any step of irdma_rereg_mr_trans
fails after the new umem is allocated, it releases the umem,
but does not set iwmr->region to NULL. The problem is that
this failure is propagated to the user, who will then call
ibv_dereg_mr (as they should). Then, the dereg_mr path will
see a non-NULL umem and attempt to call ib_umem_release again.

Fix this by setting iwmr->region to NULL after ib_umem_release.

Fixed: 5ac388db27 ("RDMA/irdma: Add support to re-register a memory region")
Signed-off-by: Jacob Moroni <jmoroni@google.com>
Link: https://patch.msgid.link/20260227152743.1183388-1-jmoroni@google.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>
This commit is contained in:
Jacob Moroni 2026-02-27 15:27:43 +00:00 committed by Leon Romanovsky
parent 11439c4635
commit 29a3edd700
1 changed files with 1 additions and 0 deletions
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1
drivers/infiniband/hw/irdma/verbs.c
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@ -3723,6 +3723,7 @@ static int irdma_rereg_mr_trans(struct irdma_mr *iwmr, u64 start, u64 len,
err:
ib_umem_release(region);
iwmr->region = NULL;
return err;
}