kbuild: fix a buffer overflow in modpost

When passing an file name > 1k the stack could be overflowed.
Not really a security issue, but still better plugged.
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

1 files changed, 2 insertions, 1 deletions

diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index 404ee0d0aac6..4d1c59063b27 100644
--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -1656,7 +1656,6 @@ int main(int argc, char **argv)
 {
         struct module *mod;
         struct buffer buf = { };
-        char fname[SZ];
         char *kernel_read = NULL, *module_read = NULL;
         char *dump_write = NULL;
         int opt;
@@ -1709,6 +1708,8 @@ int main(int argc, char **argv)
         err = 0;
 
         for (mod = modules; mod; mod = mod->next) {
+                char fname[strlen(mod->name) + 10];
+
                 if (mod->skip)
                         continue;