From: Hugh Dickins <hughd@google.com>
Date: Sun, 28 Sep 2025 04:28:06 +0000 (-0700)
Subject: modpost: Initialize builtin_modname to stop SIGSEGVs
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=2ea77fca84f07849aa995271271340d262d0c2e9;p=thirdparty%2Fkernel%2Fstable.git

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@google.com>
Reviewed-by: Nicolas Schier <nsc@kernel.org>
Link: https://patch.msgid.link/4590a243-0a7e-b7e6-e2d3-cd1b41a12237@google.com
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
---

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);
 }