lkml.org 
[lkml]   [2020]   [May]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 4.19 43/81] apparmor: Fix use-after-free in aa_audit_rule_init
Date
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
@@ -201,8 +201,9 @@ 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;

\
 
 \ /
  Last update: 2020-05-26 21:28    [W:0.289 / U:2.220 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site