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| author | Xin Xiong <xiongx18@fudan.edu.cn> | 2022-04-28 06:39:08 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-08-25 12:15:36 +0300 |
| commit | f4d5c7796571624e3f380b447ada52834270a287 (patch) | |
| tree | 7a74234db42c5efde9ac3c4e493f7476d1bbce04 /security | |
| parent | 7af35951404b134731926cf80a218db7b1795ae9 (diff) | |
| download | linux-f4d5c7796571624e3f380b447ada52834270a287.tar.xz | |
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 ec15bee2046c..85dc8a548c4b 100644 --- a/security/apparmor/mount.c +++ b/security/apparmor/mount.c @@ -686,6 +686,7 @@ 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); |