libnv: Fix array unpack endianness logic

When a nvlist(9) is converted into a binary buffer by nvlist_pack(9),
the host endianness is encoded in the nvlist_header of the binary
buffer. The nvlist_unpack(9) function converts a given binary buffer
to an nvlist. In the conversion process the endianness encoded in the
nvlist_header is evaluated and -- should the encoded endianness differ
from the endianess of the decoding host -- endianness conversion is
applied to nvlist_header and nvpair_header elements as well as
to some nvpair values.

In 2015 @oshogbo extended libnv with array support (in 347a39b).
The unpacking code misses the possible need to convert the endianness
of the nvph_nitems element of nvpair_headers.

The patch (re)enables libnv to unpack nvlists regardless of the
endianness of the packing host.

Pull Request:	https://github.com/freebsd/freebsd-src/pull/528

1 files changed, 2 insertions, 0 deletions

diff --git a/sys/contrib/libnv/bsd_nvpair.c b/sys/contrib/libnv/bsd_nvpair.c
index 6405dcd1c516..00eee223fe92 100644
--- a/sys/contrib/libnv/bsd_nvpair.c
+++ b/sys/contrib/libnv/bsd_nvpair.c
@@ -661,11 +661,13 @@ nvpair_unpack_header(bool isbe, nvpair_t *nvp, const unsigned char *ptr,
 	if (!isbe) {
 		nvphdr.nvph_namesize = le16toh(nvphdr.nvph_namesize);
 		nvphdr.nvph_datasize = le64toh(nvphdr.nvph_datasize);
+		nvphdr.nvph_nitems = le64toh(nvphdr.nvph_nitems);
 	}
 #else
 	if (isbe) {
 		nvphdr.nvph_namesize = be16toh(nvphdr.nvph_namesize);
 		nvphdr.nvph_datasize = be64toh(nvphdr.nvph_datasize);
+		nvphdr.nvph_nitems = be64toh(nvphdr.nvph_nitems);
 	}
 #endif