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| author | Xin Xiong <xiongx18@fudan.edu.cn> | 2022-04-28 11:39:08 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-08-25 11:11:32 +0200 |
| commit | d53194707d2a1851be027cd74266b96ceff799d3 (patch) | |
| tree | 22a5946a1359a97a915d7b8973fef768f55b28d0 /security | |
| parent | c912dba2cc7d781a25c535d400e285523c5a29ad (diff) | |
| download | linux-rt-d53194707d2a1851be027cd74266b96ceff799d3.tar.gz | |
apparmor: fix reference count leak in aa_pivotroot()
commit 11c3627ec6b56c1525013f336f41b79a983b4d46 upstream.
The aa_pivotroot() function has a reference counting bug in a specific
path. When aa_replace_current_label() returns on success, the function
forgets to decrement the reference count of “target”, which is
increased earlier by build_pivotroot(), causing a reference leak.
Fix it by decreasing the refcount of “target” in that path.
Fixes: 2ea3ffb7782a ("apparmor: add mount mediation")
Co-developed-by: Xiyu Yang <xiyuyang19@fudan.edu.cn>
Signed-off-by: Xiyu Yang <xiyuyang19@fudan.edu.cn>
Co-developed-by: Xin Tan <tanxin.ctf@gmail.com>
Signed-off-by: Xin Tan <tanxin.ctf@gmail.com>
Signed-off-by: Xin Xiong <xiongx18@fudan.edu.cn>
Signed-off-by: John Johansen <john.johansen@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'security')
| -rw-r--r-- | security/apparmor/mount.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/security/apparmor/mount.c b/security/apparmor/mount.c index 79e50598a3e8..21f0d2007292 100644 --- a/security/apparmor/mount.c +++ b/security/apparmor/mount.c @@ -687,6 +687,7 @@ int aa_pivotroot(struct aa_label *label, const struct path *old_path, aa_put_label(target); goto out; } + aa_put_label(target); } else /* already audited error */ error = PTR_ERR(target); |