kbuild: fix segmentation fault in modpost

If modpost was called manually with filenames without '/'
then modpost would segfault.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index e1f2b31..281abb7 100644 (file)
--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -1345,6 +1345,7 @@ static void add_depends(struct buffer *b, struct module *mod,
        buf_printf(b, "__attribute__((section(\".modinfo\"))) =\n");
        buf_printf(b, "\"depends=");
        for (s = mod->unres; s; s = s->next) {
+               const char *p;
                if (!s->module)
                        continue;
 
@@ -1352,8 +1353,11 @@ static void add_depends(struct buffer *b, struct module *mod,
                        continue;
 
                s->module->seen = 1;
-               buf_printf(b, "%s%s", first ? "" : ",",
-                          strrchr(s->module->name, '/') + 1);
+               if ((p = strrchr(s->module->name, '/')) != NULL)
+                       p++;
+               else
+                       p = s->module->name;
+               buf_printf(b, "%s%s", first ? "" : ",", p);
                first = 0;
        }
        buf_printf(b, "\";\n");