linux-kernel - [PATCH next] modpost: Initialize builtin

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Message-ID: <4590a243-0a7e-b7e6-e2d3-cd1b41a12237@google.com>
Date: Sat, 27 Sep 2025 21:28:06 -0700 (PDT)
From: Hugh Dickins <hughd@...gle.com>
To: Nathan Chancellor <nathan@...nel.org>
cc: Alexey Gladkov <legion@...nel.org>, Masahiro Yamada <masahiroy@...nel.org>, 
    Stephen Rothwell <sfr@...b.auug.org.au>, Nicolas Shier <nsc@...nel.org>, 
    linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH next] modpost: Initialize builtin_modname to stop SIGSEGVs

Segmentation fault ./scripts/mod/modpost -o vmlinux.symvers vmlinux.o
stops the kernel build.  It comes when write_vmlinux_export_c_file()
tries to buf_printf alias->builtin_modname.  malloc'ed memory is not
necessarily zeroed.  NULL new->builtin_modname before adding to aliases.

Fixes: 5ab23c7923a1 ("modpost: Create modalias for builtin modules")
Signed-off-by: Hugh Dickins <hughd@...gle.com>
---
 scripts/mod/file2alias.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/scripts/mod/file2alias.c b/scripts/mod/file2alias.c
index 7da9735e7ab3..b3333560b95e 100644
--- a/scripts/mod/file2alias.c
+++ b/scripts/mod/file2alias.c
@@ -94,6 +94,7 @@ module_alias_printf(struct module *mod, bool append_wildcard,
 		}
 	}
 
+	new->builtin_modname = NULL;
 	list_add_tail(&new->node, &mod->aliases);
 }
 
-- 
2.48.2