RDMA/uverbs: Don't fail in creation of multiple flows

The conversion from offsetof() calculations to sizeof()
wrongly behaved for missed exact size and in scenario with
more than one flow.

In such scenario we got "create flow failed, flow 10: 8 bytes
left from uverb cmd" error, which is wrong because the size of
kern_spec is exactly 8 bytes, and we were not supposed to fail.

Cc: <stable@vger.kernel.org> # 3.12
Fixes: 4fae7f170416 ("RDMA/uverbs: Fix slab-out-of-bounds in ib_uverbs_ex_create_flow")
Reported-by: Ran Rozenstein <ranro@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

diff --git a/drivers/infiniband/core/uverbs_cmd.c b/drivers/infiniband/core/uverbs_cmd.c
index 87ffeebc0b28474edd4946c77dffc52fe3902b4a..cc06e8404e9bf07c6d0acccd81490a0ba78a94f7 100644 (file)
--- a/drivers/infiniband/core/uverbs_cmd.c
+++ b/drivers/infiniband/core/uverbs_cmd.c
@@ -3586,7 +3586,7 @@ int ib_uverbs_ex_create_flow(struct ib_uverbs_file *file,
        kern_spec = kern_flow_attr->flow_specs;
        ib_spec = flow_attr + 1;
        for (i = 0; i < flow_attr->num_of_specs &&
-                       cmd.flow_attr.size > sizeof(*kern_spec) &&
+                       cmd.flow_attr.size >= sizeof(*kern_spec) &&
                        cmd.flow_attr.size >= kern_spec->size;
             i++) {
                err = kern_spec_to_ib_spec(