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

[ Upstream commit c5e5c48c16 ]

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>
This commit is contained in:
chenzefeng 2019-08-06 15:46:33 +08:00 committed by Greg Kroah-Hartman
parent 6610b57ed8
commit 06e87c9504
1 changed files with 6 additions and 2 deletions
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8
arch/ia64/kernel/module.c
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@ -913,8 +913,12 @@ 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;
}
}