From: Leon Romanovsky <leonro@xxxxxxxxxxxx>
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>
---
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 50a4cfd09264..090e5724d038 100644
--- a/drivers/infiniband/core/ucma.c
+++ b/drivers/infiniband/core/ucma.c
@@ -1339,7 +1339,7 @@ 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;
@@ -1348,7 +1348,9 @@ 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;
}
--
2.14.3
--
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