From: Shamir Rabinovitch <shamir.rabinovitch@xxxxxxxxxx>
commit ef95a90ae6f4f21990e1f7ced6719784a409e811 upstream.
Validating input parameters should be done before getting the cm_id
otherwise it can leak a cm_id reference.
Fixes: 6a21dfc0d0db ("RDMA/ucma: Limit possible option size")
Signed-off-by: Shamir Rabinovitch <shamir.rabinovitch@xxxxxxxxxx>
Reviewed-by: Leon Romanovsky <leonro@xxxxxxxxxxxx>
Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxxxx>
[iwamatsu: Backported to 4.4, 4.9 and 4.14: adjust context]
Signed-off-by: Nobuhiro Iwamatsu (CIP) <nobuhiro1.iwamatsu@xxxxxxxxxxxxx>
---
drivers/infiniband/core/ucma.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/infiniband/core/ucma.c b/drivers/infiniband/core/ucma.c
index 3e4d3d5560bf10..6315f77b4a58c1 100644
--- a/drivers/infiniband/core/ucma.c
+++ b/drivers/infiniband/core/ucma.c
@@ -1295,13 +1295,13 @@ static ssize_t ucma_set_option(struct ucma_file *file, const char __user *inbuf,
if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
return -EFAULT;
+ if (unlikely(cmd.optlen > KMALLOC_MAX_SIZE))
+ return -EINVAL;
+
ctx = ucma_get_ctx(file, cmd.id);
if (IS_ERR(ctx))
return PTR_ERR(ctx);
- if (unlikely(cmd.optlen > KMALLOC_MAX_SIZE))
- return -EINVAL;
-
optval = memdup_user((void __user *) (unsigned long) cmd.optval,
cmd.optlen);
if (IS_ERR(optval)) {
--
2.28.0
