tar: fix problem handling tarballs with chksums prepended by spaces

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

diff --git a/archival/libunarchive/get_header_tar.c b/archival/libunarchive/get_header_tar.c
index b8d7648ecb4640faee6edece83ea7647b14fe2aa..1f799277b2a87f70b83e0f2fa14b9a44f81716c4 100644 (file)
--- a/archival/libunarchive/get_header_tar.c
+++ b/archival/libunarchive/get_header_tar.c
@@ -274,7 +274,8 @@ char FAST_FUNC get_header_tar(archive_handle_t *archive_handle)
                        bb_error_msg_and_die("invalid tar header checksum");
                }
        }
-       sum = xstrtoul(tar.chksum, 8);
+       /* don't use xstrtoul, tar.chksum may have leading spaces */
+       sum = strtoul(tar.chksum, NULL, 8);
        if (sum_u != sum IF_FEATURE_TAR_OLDSUN_COMPATIBILITY(&& sum_s != sum)) {
                bb_error_msg_and_die("invalid tar header checksum");
        }