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pkg/devicemapper: fix invalid usage of reflect.SliceHeader 

The current usage of reflect.SliceHeader violates rule 6th of
unsafe.Pointer conversion. In short, reflect.SliceHeader could not be
used as plain struct.

See https://golang.org/pkg/unsafe/#Pointer

Signed-off-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
This commit is contained in:
Cuong Manh Le 2020-11-03 14:16:03 +07:00
parent 7bb1944edb
commit c208f03fbd
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GPG Key ID: C3FA65829435642E
1 changed files with 5 additions and 6 deletions
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11
pkg/devicemapper/devmapper_wrapper.go
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@ -150,12 +150,11 @@ func dmTaskGetDepsFct(task *cdmTask) *Deps {
}
// golang issue: https://github.com/golang/go/issues/11925
hdr := reflect.SliceHeader{
Data: uintptr(unsafe.Pointer(uintptr(unsafe.Pointer(Cdeps)) + unsafe.Sizeof(*Cdeps))),
Len: int(Cdeps.count),
Cap: int(Cdeps.count),
}
devices := *(*[]C.uint64_t)(unsafe.Pointer(&hdr))
var devices []C.uint64_t
devicesHdr := (*reflect.SliceHeader)(unsafe.Pointer(&devices))
devicesHdr.Data = uintptr(unsafe.Pointer(uintptr(unsafe.Pointer(Cdeps)) + unsafe.Sizeof(*Cdeps)))
devicesHdr.Len = int(Cdeps.count)
devicesHdr.Cap = int(Cdeps.count)
deps := &Deps{
Count: uint32(Cdeps.count),