Update vendor/libarchive to git de20494ba2a4fcff8b56010faa75467ad8d5a40b

Relevant vendor changes:
  PR #926: ensure ar strtab is null terminated

2 files changed, 4 insertions, 3 deletions

diff --git a/libarchive/archive_cryptor_private.h b/libarchive/archive_cryptor_private.h
index 0ca544b57971..b9759220df69 100644
--- a/libarchive/archive_cryptor_private.h
+++ b/libarchive/archive_cryptor_private.h
@@ -64,7 +64,7 @@ typedef struct {
 } archive_crypto_ctx;
 
 #elif defined(_WIN32) && !defined(__CYGWIN__) && defined(HAVE_BCRYPT_H)
-#include <Bcrypt.h>
+#include <bcrypt.h>
 
 /* Common in other bcrypt implementations, but missing from VS2008. */
 #ifndef BCRYPT_SUCCESS
diff --git a/libarchive/archive_write_set_format_ar.c b/libarchive/archive_write_set_format_ar.c
index c9771d81a128..441119d5d714 100644
--- a/libarchive/archive_write_set_format_ar.c
+++ b/libarchive/archive_write_set_format_ar.c
@@ -374,13 +374,14 @@ archive_write_ar_data(struct archive_write *a, const void *buff, size_t s)
 			return (ARCHIVE_WARN);
 		}
 
-		ar->strtab = (char *)malloc(s);
+		ar->strtab = (char *)malloc(s + 1);
 		if (ar->strtab == NULL) {
 			archive_set_error(&a->archive, ENOMEM,
 			    "Can't allocate strtab buffer");
 			return (ARCHIVE_FATAL);
 		}
-		strncpy(ar->strtab, buff, s);
+		memcpy(ar->strtab, buff, s);
+		ar->strtab[s] = '\0';
 		ar->has_strtab = 1;
 	}