From: Navid Emamdoost <navid.emamdoost@gmail.com> hulk inclusion category: bugfix bugzilla: NA CVE: CVE-2019-18814 --------------------------- In the implementation of aa_audit_rule_init(), when aa_label_parse() fails the allocated memory for rule is released using aa_audit_rule_free(). But after this release, the return statement tries to access the label field of the rule which results in use-after-free. Before releasing the rule, copy errNo and return it after release. Fixes: 52e8c38001d8 ("apparmor: Fix memory leak of rule on error exit path") Signed-off-by: Navid Emamdoost <navid.emamdoost@gmail.com> Reviewed-by: Tyler Hicks <tyhicks@canonical.com> Signed-off-by: Jason Yan <yanaijie@huawei.com> Reviewed-by: Hanjun Guo <guohanjun@huawei.com> Signed-off-by: Yang Yingliang <yangyingliang@huawei.com> --- security/apparmor/audit.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/security/apparmor/audit.c b/security/apparmor/audit.c index eeaddfe..70b9730 100644 --- a/security/apparmor/audit.c +++ b/security/apparmor/audit.c @@ -201,8 +201,9 @@ int aa_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule) rule->label = aa_label_parse(&root_ns->unconfined->label, rulestr, GFP_KERNEL, true, false); if (IS_ERR(rule->label)) { + int err = PTR_ERR(rule->label); aa_audit_rule_free(rule); - return PTR_ERR(rule->label); + return err; } *vrule = rule; -- 1.8.3