From c8d3bcbfc5eab3f01cf373d039af725f3b488813 Mon Sep 17 00:00:00 2001 From: Leon Romanovsky Date: Sun, 25 Mar 2018 11:39:05 +0300 Subject: [PATCH] RDMA/ucma: Check that device exists prior to accessing it Ensure that device exists prior to accessing its properties. Reported-by: Fixes: 75216638572f ("RDMA/cma: Export rdma cm interface to userspace") Signed-off-by: Leon Romanovsky Signed-off-by: Jason Gunthorpe --- drivers/infiniband/core/ucma.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/infiniband/core/ucma.c b/drivers/infiniband/core/ucma.c index 0811f58c670f..21585055cf32 100644 --- a/drivers/infiniband/core/ucma.c +++ b/drivers/infiniband/core/ucma.c @@ -1336,7 +1336,7 @@ static ssize_t ucma_notify(struct ucma_file *file, const char __user *inbuf, { struct rdma_ucm_notify cmd; struct ucma_context *ctx; - int ret; + int ret = -EINVAL; if (copy_from_user(&cmd, inbuf, sizeof(cmd))) return -EFAULT; @@ -1345,7 +1345,9 @@ static ssize_t ucma_notify(struct ucma_file *file, const char __user *inbuf, 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; } -- 2.30.2