Commit bfd6664e authored Aug 06, 2019 by chenzefeng Committed by Greg Kroah-Hartman Oct 05, 2019

ia64:unwind: fix double free for mod->arch.init_unw_table



[ Upstream commit c5e5c48c16422521d363c33cfb0dcf58f88c119b ]

The function free_module in file kernel/module.c as follow:

void free_module(struct module *mod) {
	......
	module_arch_cleanup(mod);
	......
	module_arch_freeing_init(mod);
	......
}

Both module_arch_cleanup and module_arch_freeing_init function
would free the mod->arch.init_unw_table, which cause double free.

Here, set mod->arch.init_unw_table = NULL after remove the unwind
table to avoid double free.

Signed-off-by: chenzefeng <chenzefeng2@huawei.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

parent faad3576

arch/ia64/kernel/module.c

+6 −2

Original line number	Diff line number	Diff line
		@@ -912,8 +912,12 @@ module_finalize (const Elf_Ehdr hdr, const Elf_Shdr sechdrs, struct module *mo
		void
		module_arch_cleanup (struct module *mod)
		{
		if (mod->arch.init_unw_table)
		if (mod->arch.init_unw_table) {
		unw_remove_unwind_table(mod->arch.init_unw_table);
		if (mod->arch.core_unw_table)
		mod->arch.init_unw_table = NULL;
		}
		if (mod->arch.core_unw_table) {
		unw_remove_unwind_table(mod->arch.core_unw_table);
		mod->arch.core_unw_table = NULL;
		}
		}