| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.15 26/72] RDMA/ucma: Check that device exists prior to accessing it | Date | Fri, 6 Apr 2018 15:24:01 +0200 |
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4.15-stable review patch. If anyone has any objections, please let me know.
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From: Leon Romanovsky <leonro@mellanox.com>
commit c8d3bcbfc5eab3f01cf373d039af725f3b488813 upstream.
Ensure that device exists prior to accessing its properties.
Reported-by: <syzbot+71655d44855ac3e76366@syzkaller.appspotmail.com> Fixes: 75216638572f ("RDMA/cma: Export rdma cm interface to userspace") Signed-off-by: Leon Romanovsky <leonro@mellanox.com> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/infiniband/core/ucma.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
--- a/drivers/infiniband/core/ucma.c +++ b/drivers/infiniband/core/ucma.c @@ -1335,7 +1335,7 @@ static ssize_t ucma_notify(struct ucma_f { struct rdma_ucm_notify cmd; struct ucma_context *ctx; - int ret; + int ret = -EINVAL; if (copy_from_user(&cmd, inbuf, sizeof(cmd))) return -EFAULT; @@ -1344,7 +1344,9 @@ static ssize_t ucma_notify(struct ucma_f if (IS_ERR(ctx)) return PTR_ERR(ctx); - ret = rdma_notify(ctx->cm_id, (enum ib_event_type) cmd.event); + if (ctx->cm_id->device) + ret = rdma_notify(ctx->cm_id, (enum ib_event_type)cmd.event); + ucma_put_ctx(ctx); return ret; }
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