Ignore file flag bits that we don't support. In particular, this

corrects a segfault seen when archiving files from NTFS (which sets
bits in st_flags that are not documented in <sys/stat.h>.)

Thanks to: Doug Rabson

1 files changed, 2 insertions, 0 deletions

diff --git a/lib/libarchive/archive_entry.c b/lib/libarchive/archive_entry.c
index 204182b..dfea3d3 100644
--- a/lib/libarchive/archive_entry.c
+++ b/lib/libarchive/archive_entry.c
@@ -1366,6 +1366,8 @@ ae_fflagstostr(unsigned long bitset, unsigned long bitclear)
 			bits &= ~(flag->set | flag->clear);
 		}
 
+	if (length == 0)
+		return (NULL);
 	string = malloc(length);
 	if (string == NULL)
 		return (NULL);