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

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>

diff --git a/arch/ia64/kernel/module.c b/arch/ia64/kernel/module.c
index 326448f9df16068392e49af096afd1c8b2713131..1a42ba885188a5c8e865bb28108c685ed1a37515 100644 (file)
--- a/arch/ia64/kernel/module.c
+++ b/arch/ia64/kernel/module.c
@@ -914,10 +914,14 @@ 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;
+       }
 }
 
 void *dereference_module_function_descriptor(struct module *mod, void *ptr)