Bug 644

	FaxClient::makeHeader() segfaults on improper format strings

diff --git a/util/FaxClient.c++ b/util/FaxClient.c++
index 7785577ea03870293298e8a982c69419e9d748be..0bee7ad4d67785529f5b993b5ef428cc263c4466 100644 (file)
--- a/util/FaxClient.c++
+++ b/util/FaxClient.c++
@@ -1537,6 +1537,8 @@ FaxClient::makeHeader(const char* fmt, const FaxFmtHeader fmts[], fxStr& header)
            char* fp = fspec;
            *fp++ = '%';
            char c = *++cp;
+           if (c == '\0')
+               break;
            if (c == '-')
                *fp++ = c, c = *++cp;
            if (isdigit(c)) {