From: Ye Weihua yeweihua4@huawei.com
hulk inclusion category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I4IGQ2 CVE: NA
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Before a module is deleted, the kernel traverses the jump_label section to release resources applied by each jump entry. Common modules apply for these resources before module initialization, but livepatch modules apply during livepatch redirection.
Therefore, when a livepatch module fails to be inserted, the resources to be applied by jump_label are not applied. As a result, a panic occurs when a null pointer is accessed during resource release.
To solve the this problem, skip resource release if jump label is not relocated.
Signed-off-by: Ye Weihua yeweihua4@huawei.com Reviewed-by: Yang Jihong yangjihong1@huawei.com Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com --- kernel/jump_label.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/kernel/jump_label.c b/kernel/jump_label.c index 282d81eb5aa4..7470cdc432a0 100644 --- a/kernel/jump_label.c +++ b/kernel/jump_label.c @@ -695,6 +695,9 @@ static void jump_label_del_module(struct module *mod) struct static_key *key = NULL; struct static_key_mod *jlm, **prev;
+ if (unlikely(!mod_klp_rel_completed(mod))) + return; + for (iter = iter_start; iter < iter_stop; iter++) { if (jump_entry_key(iter) == key) continue;