From fe48aecb4df837540f13b5216f27ddb306aaf4b9 Mon Sep 17 00:00:00 2001
From: Leon Romanovsky <leonro@mellanox.com>
Date: Sun, 1 Jul 2018 15:31:54 +0300
Subject: [PATCH] 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>
---
drivers/infiniband/core/uverbs_cmd.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/infiniband/core/uverbs_cmd.c b/drivers/infiniband/core/uverbs_cmd.c
index 87ffeebc0b284..cc06e8404e9bf 100644
--- 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(
--
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