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RDMA/uverbs: Add a check for uverbs_attr_get to uverbs_copy_to_struct_or_zero 

All current callers for uverbs_copy_to_struct_or_zero() already check that
the attribute exists, but it make sense to verify the result like the
other functions do.

Link: https://lore.kernel.org/r/20191018081533.8544-1-hslester96@gmail.com
Signed-off-by: Chuhong Yuan <hslester96@gmail.com>
Reviewed-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
alistair/sunxi64-5.5-dsi
Chuhong Yuan 2019-10-18 16:15:34 +08:00 committed by Jason Gunthorpe
parent d3bd939670
commit a29e1012c1
1 changed files with 3 additions and 0 deletions
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3
drivers/infiniband/core/uverbs_ioctl.c
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@ -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))