3.2.102-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: Leon Romanovsky <leonro@xxxxxxxxxxxx> commit c8d3bcbfc5eab3f01cf373d039af725f3b488813 upstream. Ensure that device exists prior to accessing its properties. Reported-by: <syzbot+71655d44855ac3e76366@xxxxxxxxxxxxxxxxxxxxxxxxx> Fixes: 75216638572f ("RDMA/cma: Export rdma cm interface to userspace") Signed-off-by: Leon Romanovsky <leonro@xxxxxxxxxxxx> Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxxxx> Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx> --- 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 @@ -1043,7 +1043,7 @@ 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; @@ -1052,7 +1052,9 @@ 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; }