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modpost: Initialize builtin_modname to stop SIGSEGVs

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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: 5ab23c7923 ("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>
This commit is contained in:
Hugh Dickins
2025-09-27 21:28:06 -07:00
committed by Nathan Chancellor
parent 37fac070eb
commit 2ea77fca84
1 changed files with 1 additions and 0 deletions
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scripts/mod/file2alias.c
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@@ -94,6 +94,7 @@ module_alias_printf(struct module *mod, bool append_wildcard,
}
}
new->builtin_modname = NULL;
list_add_tail(&new->node, &mod->aliases);
}