From: Hugh Dickins <hughd@google.com>
To: Nathan Chancellor <nathan@kernel.org>
Cc: Alexey Gladkov <legion@kernel.org>,
Masahiro Yamada <masahiroy@kernel.org>,
Stephen Rothwell <sfr@canb.auug.org.au>,
Nicolas Shier <nsc@kernel.org>,
linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH next] modpost: Initialize builtin_modname to stop SIGSEGVs
Date: Sat, 27 Sep 2025 21:28:06 -0700 (PDT) [thread overview]
Message-ID: <4590a243-0a7e-b7e6-e2d3-cd1b41a12237@google.com> (raw)
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@google.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
next reply other threads:[~2025-09-28 4:28 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-09-28 4:28 Hugh Dickins [this message]
2025-09-28 5:37 ` [PATCH next] modpost: Initialize builtin_modname to stop SIGSEGVs Nicolas Schier
2025-09-28 12:11 ` Nathan Chancellor
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4590a243-0a7e-b7e6-e2d3-cd1b41a12237@google.com \
--to=hughd@google.com \
--cc=legion@kernel.org \
--cc=linux-kbuild@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=masahiroy@kernel.org \
--cc=nathan@kernel.org \
--cc=nsc@kernel.org \
--cc=sfr@canb.auug.org.au \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox