do not segfault if make_cache_entry failed

diff --git a/builtin-mailinfo.c b/builtin-mailinfo.c
index 3577382d7039784e8a0c5ef9ce3d765409abb2d8..e890f7a6d1ff7248aed4f03ebbcdfafd7e472dad 100644 (file)
--- a/builtin-mailinfo.c
+++ b/builtin-mailinfo.c
@@ -107,7 +107,7 @@ static void handle_from(const struct strbuf *from)
        el = strcspn(at, " \n\t\r\v\f>");
        strbuf_reset(&email);
        strbuf_add(&email, at, el);
-       strbuf_remove(&f, at - f.buf, el + 1);
+       strbuf_remove(&f, at - f.buf, el + (at[el] ? 1 : 0));
 
        /* The remainder is name.  It could be "John Doe <john.doe@xz>"
         * or "john.doe@xz (John Doe)", but we have removed the
@@ -175,7 +175,7 @@ static void handle_content_type(struct strbuf *line)
                 message_type = TYPE_OTHER;
        if (slurp_attr(line->buf, "boundary=", boundary)) {
                strbuf_insert(boundary, 0, "--", 2);
-               if (content_top++ >= &content[MAX_BOUNDARIES]) {
+               if (++content_top > &content[MAX_BOUNDARIES]) {
                        fprintf(stderr, "Too many boundaries to handle\n");
                        exit(1);
                }
@@ -603,7 +603,7 @@ static void handle_filter(struct strbuf *line);
 static int find_boundary(void)
 {
        while (!strbuf_getline(&line, fin, '\n')) {
-               if (is_multipart_boundary(&line))
+               if (*content_top && is_multipart_boundary(&line))
                        return 1;
        }
        return 0;
@@ -626,7 +626,7 @@ static int handle_boundary(void)
                /* technically won't happen as is_multipart_boundary()
                   will fail first.  But just in case..
                 */
-               if (content_top-- < content) {
+               if (--content_top < content) {
                        fprintf(stderr, "Detected mismatched boundaries, "
                                        "can't recover\n");
                        exit(1);