Merge two cpio fixes from libarchive.googlecode.com:

 1) Avoid an infinite loop in the header resync for certain malformed
    archives.
 2) Don't try to match hardlinks if the nlinks count is < 2.   This
    reduces the likelihood of a false hardlink match due to ino truncation.

MFC after:	7 days

1 files changed, 5 insertions, 2 deletions

diff --git a/lib/libarchive/archive_read_support_format_cpio.c b/lib/libarchive/archive_read_support_format_cpio.c
index 3bf05ce..f16c6cb 100644
--- a/lib/libarchive/archive_read_support_format_cpio.c
+++ b/lib/libarchive/archive_read_support_format_cpio.c
@@ -356,7 +356,7 @@ find_newc_header(struct archive_read *a)
 		 * Scan ahead until we find something that looks
 		 * like an odc header.
 		 */
-		while (p + sizeof(struct cpio_newc_header) < q) {
+		while (p + sizeof(struct cpio_newc_header) <= q) {
 			switch (p[5]) {
 			case '1':
 			case '2':
@@ -490,7 +490,7 @@ find_odc_header(struct archive_read *a)
 		 * Scan ahead until we find something that looks
 		 * like an odc header.
 		 */
-		while (p + sizeof(struct cpio_odc_header) < q) {
+		while (p + sizeof(struct cpio_odc_header) <= q) {
 			switch (p[5]) {
 			case '7':
 				if (memcmp("070707", p, 6) == 0
@@ -731,6 +731,9 @@ record_hardlink(struct cpio *cpio, struct archive_entry *entry)
 	dev_t dev;
 	ino_t ino;
 
+	if (archive_entry_nlink(entry) <= 1)
+		return;
+
 	dev = archive_entry_dev(entry);
 	ino = archive_entry_ino(entry);