@@ -401,7 +401,7 @@ chktar(struct header *h)
if (h->prefix[0] == '\0' && h->name[0] == '\0')
goto bad;
if (strncmp("ustar", h->magic, 5))
if (h->magic[0] && strncmp("ustar", h->magic, 5))
memcpy(tmp, h->chksum, sizeof(tmp));
for (i = 0; i < sizeof(tmp); i++)
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