[PATCH] IB/uverbs: Add a check for uverbs_attr_get

[Chuhong Yuan]

Only uverbs_copy_to_struct_or_zero in uverbs_ioctl.c does not have a
check for uverbs_attr_get.
Although its usage in uverbs_response has a check for attr's validity,
UVERBS_HANDLER does not.
Therefore, it is better to add a check like other functions in
uverbs_ioctl.c.

Signed-off-by: Chuhong Yuan <hsleste...@gmail.com>
---
 drivers/infiniband/core/uverbs_ioctl.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/infiniband/core/uverbs_ioctl.c 
b/drivers/infiniband/core/uverbs_ioctl.c
index 61758201d9b2..269938f59d3f 100644
--- a/drivers/infiniband/core/uverbs_ioctl.c
+++ b/drivers/infiniband/core/uverbs_ioctl.c
@@ -795,6 +795,9 @@ int uverbs_copy_to_struct_or_zero(const struct 
uverbs_attr_bundle *bundle,
 {
        const struct uverbs_attr *attr = uverbs_attr_get(bundle, idx);
 
+       if (IS_ERR(attr))
+               return PTR_ERR(attr);
+
        if (size < attr->ptr_attr.len) {
                if (clear_user(u64_to_user_ptr(attr->ptr_attr.data) + size,
                               attr->ptr_attr.len - size))
-- 
2.20.1