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commit24c3456c8dupstream. If for some reason we failed to query the mr status, we need to make sure to provide sufficient information for an ambiguous error (guard error on sector 0). Fixes:0a7a08ad6f("IB/iser: Implement check_protection") Cc: <stable@vger.kernel.org> Reported-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Sagi Grimberg <sagi@grimberg.me> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>