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>

diff --git a/arch/ia64/kernel/module.c b/arch/ia64/kernel/module.c
index d1d945c6bd05f05d567be65357210210bfaae48e..9fe114620b9d670667157525d76e3b73bd8660f3 100644 (file)
--- a/arch/ia64/kernel/module.c
+++ b/arch/ia64/kernel/module.c
@@ -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;
+       }
 }