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From:   Stephen Smalley <stephen.smalley.work@gmail.com>
Date:   Wed, 10 Jun 2020 18:06:50 -0400
Message-ID: <CAEjxPJ6O3HZ_xdGDvuvYiUNqiPxqvo37V7d5ckLpDM=qF426tw@mail.gmail.com>
Subject: Re: [PATCH v2 1/1] selinux: fix double free
To:     trix@redhat.com
Cc:     Paul Moore <paul@paul-moore.com>,
        Eric Paris <eparis@parisplace.org>,
        Ondrej Mosnacek <omosnace@redhat.com>,
        Jeffrey Vander Stoep <jeffv@google.com>, rgb@redhat.com,
        SElinux list <selinux@vger.kernel.org>,
        linux-kernel <linux-kernel@vger.kernel.org>
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On Wed, Jun 10, 2020 at 5:57 PM <trix@redhat.com> wrote:
>
> From: Tom Rix <trix@redhat.com>
>
> Clang's static analysis tool reports these double free memory errors.
>
> security/selinux/ss/services.c:2987:4: warning: Attempt to free released memory [unix.Malloc]
>                         kfree(bnames[i]);
>                         ^~~~~~~~~~~~~~~~
> security/selinux/ss/services.c:2990:2: warning: Attempt to free released memory [unix.Malloc]
>         kfree(bvalues);
>         ^~~~~~~~~~~~~~
>
> So improve the security_get_bools error handling by freeing these variables
> and setting their return pointers to NULL and the return len to 0
>
> Signed-off-by: Tom Rix <trix@redhat.com>

Acked-by: Stephen Smalley <stephen.smalley.work@gmail.com>