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| author | David Jeffery <djeffery@redhat.com> | 2015-02-12 16:45:31 +0000 |
|---|---|---|
| committer | James Morris <james.l.morris@oracle.com> | 2015-02-16 13:45:16 +1100 |
| commit | d0709f1e66e8066c4ac6a54620ec116aa41937c0 (patch) | |
| tree | dbccabd56c8031be37c2bad08eeccea4d29ee879 /security | |
| parent | cd07db5f2770cf7f96b0202ef93533c8a9eee09f (diff) | |
| download | lwn-d0709f1e66e8066c4ac6a54620ec116aa41937c0.tar.gz lwn-d0709f1e66e8066c4ac6a54620ec116aa41937c0.zip | |
Don't leak a key reference if request_key() tries to use a revoked keyring
If a request_key() call to allocate and fill out a key attempts to insert the
key structure into a revoked keyring, the key will leak, using memory and part
of the user's key quota until the system reboots. This is from a failure of
construct_alloc_key() to decrement the key's reference count after the attempt
to insert into the requested keyring is rejected.
key_put() needs to be called in the link_prealloc_failed callpath to ensure
the unused key is released.
Signed-off-by: David Jeffery <djeffery@redhat.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: James Morris <james.l.morris@oracle.com>
Diffstat (limited to 'security')
| -rw-r--r-- | security/keys/request_key.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/security/keys/request_key.c b/security/keys/request_key.c index 0c7aea4dea54..486ef6fa393b 100644 --- a/security/keys/request_key.c +++ b/security/keys/request_key.c @@ -414,6 +414,7 @@ link_check_failed: link_prealloc_failed: mutex_unlock(&user->cons_lock); + key_put(key); kleave(" = %d [prelink]", ret); return ret; |