If a zip archive file is corruped, the compression type can be negative and

it can cause a segfault.

diff --git a/libarchive/archive_read_support_format_zip.c b/libarchive/archive_read_support_format_zip.c
index d5deab8d73abacb7bb82b0d94cebf4659b7ecb85..d8c1ebc7275824f8131b3ca831400e6a2c0edc95 100644 (file)
--- a/libarchive/archive_read_support_format_zip.c
+++ b/libarchive/archive_read_support_format_zip.c
@@ -787,7 +787,7 @@ compression_name(int compression)
                "deflation"
        };
 
-       if (compression <
+       if (0 <= compression && compression <
            (int)(sizeof(compression_names)/sizeof(compression_names[0])))
                return compression_names[compression];
        else