tar: fix problem handling tarballs with chksums prepended by spaces

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

1 files changed, 2 insertions, 1 deletions

diff --git a/archival/libunarchive/get_header_tar.c b/archival/libunarchive/get_header_tar.c
index b8d7648ec..1f799277b 100644
--- 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");
         }