diff options
| author | Michael Guralnik <michaelgur@mellanox.com> | 2018-12-09 12:58:04 +0300 |
|---|---|---|
| committer | Jason Gunthorpe <jgg@mellanox.com> | 2018-12-21 01:18:18 +0300 |
| commit | 2e8039c656224b4a21e1947f45946d32a59bae53 (patch) | |
| tree | 90738b202e103845640916c727fae63559901aca /include/rdma/uverbs_ioctl.h | |
| parent | f55c3ec42a97bca408f0208ec08e3382340c7be7 (diff) | |
| download | linux-2e8039c656224b4a21e1947f45946d32a59bae53.tar.xz | |
IB/core: uverbs copy to struct or zero helper
Add a helper to zero fill fields before copying data to
UVERBS_ATTR_STRUCT.
As UVERBS_ATTR_STRUCT can be used as an extensible struct, we want to make
sure that if the user supplies us with a struct that has new fields that
we are not aware of, we return them zeroed to the user.
This helper should be used when using UVERBS_ATTR_STRUCT for an extendable
data structure and there is a need to make sure that extended members of
the struct, that the kernel doesn't handle, are returned zeroed to the
user. This is needed due to the fact that UVERBS_ATTR_STRUCT allows
non-zero values for members after 'last' member.
Signed-off-by: Michael Guralnik <michaelgur@mellanox.com>
Reviewed-by: Majd Dibbiny <majd@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Diffstat (limited to 'include/rdma/uverbs_ioctl.h')
| -rw-r--r-- | include/rdma/uverbs_ioctl.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/include/rdma/uverbs_ioctl.h b/include/rdma/uverbs_ioctl.h index bf07cd6336d3..27da906beea7 100644 --- a/include/rdma/uverbs_ioctl.h +++ b/include/rdma/uverbs_ioctl.h @@ -871,6 +871,8 @@ static inline __malloc void *uverbs_zalloc(struct uverbs_attr_bundle *bundle, int _uverbs_get_const(s64 *to, const struct uverbs_attr_bundle *attrs_bundle, size_t idx, s64 lower_bound, u64 upper_bound, s64 *def_val); +int uverbs_copy_to_struct_or_zero(const struct uverbs_attr_bundle *bundle, + size_t idx, const void *from, size_t size); #else static inline int uverbs_get_flags64(u64 *to, const struct uverbs_attr_bundle *attrs_bundle, @@ -906,6 +908,12 @@ _uverbs_get_const(s64 *to, const struct uverbs_attr_bundle *attrs_bundle, { return -EINVAL; } +static inline int +uverbs_copy_to_struct_or_zero(const struct uverbs_attr_bundle *bundle, + size_t idx, const void *from, size_t size) +{ + return -EINVAL; +} #endif #define uverbs_get_const(_to, _attrs_bundle, _idx) \ |