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authorchenzefeng <chenzefeng2@huawei.com>2019-08-06 15:46:33 +0800
committerTony Luck <tony.luck@intel.com>2019-08-06 10:19:35 -0700
commitc5e5c48c16422521d363c33cfb0dcf58f88c119b (patch)
tree81123a6ceae6c96e723da2fdace4f2e5cae9a3c7 /arch/ia64
parente21a712a9685488f5ce80495b37b9fdbe96c230d (diff)
downloadlinux-c5e5c48c16422521d363c33cfb0dcf58f88c119b.tar.bz2
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>
Diffstat (limited to 'arch/ia64')
-rw-r--r--arch/ia64/kernel/module.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/arch/ia64/kernel/module.c b/arch/ia64/kernel/module.c
index 326448f9df16..1a42ba885188 100644
--- 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)