Re: [PATCH] Don't leak a key reference if request_key() tries to use a revoked keyring

From: David Howells
Date: Thu Feb 12 2015 - 11:46:23 EST

David Jeffery <djeffery@xxxxxxxxxx> wrote:

> 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.

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