3.18-stable review patch. If anyone has any objections, please let me know.
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[ Upstream commit d636bd9f12a66ea3775c9fabbf3f8e118253467a ]
In join_session_keyring(), if install_session_keyring_to_cred() were to fail, we would leak the keyring reference, just like in the bug fixed by commit 23567fd052a9 ("KEYS: Fix keyring ref leak in join_session_keyring()"). Fortunately this cannot happen currently, but we really should be more careful. Do this by adding and using a new error label at which the keyring reference is dropped.
Signed-off-by: Eric Biggers ebiggers@google.com Signed-off-by: David Howells dhowells@redhat.com Signed-off-by: James Morris james.l.morris@oracle.com Signed-off-by: Sasha Levin sashal@kernel.org --- security/keys/process_keys.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/security/keys/process_keys.c b/security/keys/process_keys.c index 85b61a3ac981..6f32ca53456a 100644 --- a/security/keys/process_keys.c +++ b/security/keys/process_keys.c @@ -808,15 +808,14 @@ long join_session_keyring(const char *name) ret = PTR_ERR(keyring); goto error2; } else if (keyring == new->session_keyring) { - key_put(keyring); ret = 0; - goto error2; + goto error3; }
/* we've got a keyring - now to install it */ ret = install_session_keyring_to_cred(new, keyring); if (ret < 0) - goto error2; + goto error3;
commit_creds(new); mutex_unlock(&key_session_mutex); @@ -826,6 +825,8 @@ long join_session_keyring(const char *name) okay: return ret;
+error3: + key_put(keyring); error2: mutex_unlock(&key_session_mutex); error: