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 --- arch/ia64/kernel/module.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/arch/ia64/kernel/module.c b/arch/ia64/kernel/module.c index 326448f..1a42ba8 100644 --- a/arch/ia64/kernel/module.c +++ b/arch/ia64/kernel/module.c @@ -914,10 +914,14 @@ struct plt_entry { 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)