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IB/mlx5: Fix reqlen validation in mlx5_ib_alloc_ucontext 

Older libraries that don't have all the new req_v2 fields
should be able to work as well. Today, if the library uses v2, it
will fail to allocate context since the size of reqlen is smaller
than the req_v2 size.

Fix the validation to be with the original req_v2 size and not
the current.

Fixes: f72300c56c ('IB/mlx5: Expose CQE version to user-space')
Signed-off-by: Majd Dibbiny <majd@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Majd Dibbiny 2016-01-28 17:51:47 +02:00 committed by Doug Ledford
parent d4584ddfc9
commit a168a41c81
1 changed files with 3 additions and 1 deletions
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4
drivers/infiniband/hw/mlx5/main.c
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@ -844,6 +844,8 @@ static struct ib_ucontext *mlx5_ib_alloc_ucontext(struct ib_device *ibdev,
int err;
int i;
size_t reqlen;
size_t min_req_v2 = offsetof(struct mlx5_ib_alloc_ucontext_req_v2,
max_cqe_version);
if (!dev->ib_active)
return ERR_PTR(-EAGAIN);
@ -854,7 +856,7 @@ static struct ib_ucontext *mlx5_ib_alloc_ucontext(struct ib_device *ibdev,
reqlen = udata->inlen - sizeof(struct ib_uverbs_cmd_hdr);
if (reqlen == sizeof(struct mlx5_ib_alloc_ucontext_req))
ver = 0;
else if (reqlen >= sizeof(struct mlx5_ib_alloc_ucontext_req_v2))
else if (reqlen >= min_req_v2)
ver = 2;
else
return ERR_PTR(-EINVAL);