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Don't leak a key reference if request_key() tries to use a revoked keyring

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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>
This commit is contained in:
David Jeffery 2015-02-12 16:45:31 +00:00 committed by James Morris
parent cd07db5f27
commit d0709f1e66
1 changed files with 1 additions and 0 deletions
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security/keys/request_key.c
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@ -414,6 +414,7 @@ static int construct_alloc_key(struct keyring_search_context *ctx,
link_prealloc_failed:
mutex_unlock(&user->cons_lock);
key_put(key);
kleave(" = %d [prelink]", ret);
return ret;