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| author | chenzefeng <chenzefeng2@huawei.com> | 2019-08-06 15:46:33 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-10-05 13:09:38 +0200 |
| commit | 87bc43e2a7754801a838a2dffa6e6a66dec29919 (patch) | |
| tree | e4dd0e00ca7bdb574d5396f0b7a4f8357c8f51c7 /arch | |
| parent | ca57eca32b3e1cd7c3d75389294dc198b904b34d (diff) | |
| download | linux-stable-87bc43e2a7754801a838a2dffa6e6a66dec29919.tar.gz linux-stable-87bc43e2a7754801a838a2dffa6e6a66dec29919.tar.bz2 linux-stable-87bc43e2a7754801a838a2dffa6e6a66dec29919.zip | |
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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/ia64/kernel/module.c | 8 |
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) |