Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 5.6 074/126] apparmor: Fix use-after-free in aa_audit_rule_init | Date | Tue, 26 May 2020 20:53:31 +0200 |
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From: Navid Emamdoost <navid.emamdoost@gmail.com>
commit c54d481d71c6849e044690d3960aaebc730224cc upstream.
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> Signed-off-by: John Johansen <john.johansen@canonical.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- security/apparmor/audit.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
--- a/security/apparmor/audit.c +++ b/security/apparmor/audit.c @@ -197,8 +197,9 @@ int aa_audit_rule_init(u32 field, u32 op 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;
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