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-rw-r--r--archival/libunarchive/get_header_tar.c19
1 files changed, 13 insertions, 6 deletions
diff --git a/archival/libunarchive/get_header_tar.c b/archival/libunarchive/get_header_tar.c
index 622f09fa5..a9659181e 100644
--- a/archival/libunarchive/get_header_tar.c
+++ b/archival/libunarchive/get_header_tar.c
@@ -69,7 +69,7 @@ char get_header_tar(archive_handle_t *archive_handle)
char padding[12]; /* 500-512 */
} tar;
char *cp;
- int sum, i;
+ int i, sum_u, sum_s, sum;
int parse_names;
if (sizeof(tar) != 512)
@@ -110,16 +110,23 @@ char get_header_tar(archive_handle_t *archive_handle)
#endif
bb_error_msg_and_die("invalid tar magic");
}
- /* Do checksum on headers */
- sum = ' ' * sizeof(tar.chksum);
+
+ /* Do checksum on headers.
+ * POSIX says that checksum is done on unsigned bytes, but
+ * Sun and HP-UX fucked it up... more details in
+ * GNU tar source. */
+ sum_s = sum_u = ' ' * sizeof(tar.chksum);
for (i = 0; i < 148 ; i++) {
- sum += ((char*)&tar)[i];
+ sum_u += ((unsigned char*)&tar)[i];
+ sum_s += ((signed char*)&tar)[i];
}
for (i = 156; i < 512 ; i++) {
- sum += ((char*)&tar)[i];
+ sum_u += ((unsigned char*)&tar)[i];
+ sum_s += ((signed char*)&tar)[i];
}
/* This field does not need special treatment (getOctal) */
- if (sum != xstrtoul(tar.chksum, 8)) {
+ sum = xstrtoul(tar.chksum, 8);
+ if (sum_u != sum && sum_s != sum) {
bb_error_msg_and_die("invalid tar header checksum");
}