diff --git a/src/syscall/syscall_freebsd.go b/src/syscall/syscall_freebsd.go index 3abc722c427e9d14bfddbee8deddbf966af4f7a4..7c7b89aab9030aa91683b372267d96bb49166217 100644 --- a/src/syscall/syscall_freebsd.go +++ b/src/syscall/syscall_freebsd.go @@ -381,8 +381,12 @@ func convertFromDirents11(buf []byte, old []byte) int { dstPos := 0 srcPos := 0 for dstPos+fixedSize < len(buf) && srcPos+oldFixedSize < len(old) { - dstDirent := (*Dirent)(unsafe.Pointer(&buf[dstPos])) - srcDirent := (*dirent_freebsd11)(unsafe.Pointer(&old[srcPos])) + var dstDirent Dirent + var srcDirent dirent_freebsd11 + + // If multiple direntries are written, sometimes when we reach the final one, + // we may have cap of old less than size of dirent_freebsd11. + copy((*[unsafe.Sizeof(srcDirent)]byte)(unsafe.Pointer(&srcDirent))[:], old[srcPos:]) reclen := roundup(fixedSize+int(srcDirent.Namlen)+1, 8) if dstPos+reclen > len(buf) { @@ -398,6 +402,7 @@ func convertFromDirents11(buf []byte, old []byte) int { dstDirent.Pad1 = 0 copy(dstDirent.Name[:], srcDirent.Name[:srcDirent.Namlen]) + copy(buf[dstPos:], (*[unsafe.Sizeof(dstDirent)]byte)(unsafe.Pointer(&dstDirent))[:]) padding := buf[dstPos+fixedSize+int(dstDirent.Namlen) : dstPos+reclen] for i := range padding { padding[i] = 0