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>

1 files changed, 6 insertions, 2 deletions

diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index e1f2b31cf34b..281abb77e033 100644
--- 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");