[libvirt] [PATCH v2 1/2] rpc: cleanup in virNetTLSContextNew

[Daniel P. Berrangé]

On Mon, Apr 15, 2019 at 08:29:42PM +0200, Adrian Brzezinski wrote:
> Failed new gnutls context allocations in virNetTLSContextNew function
> results in double free and segfault. Occasional memory leaks may also
> occur.
> 
> Signed-off-by: Adrian Brzezinski <redhat at adrb.pl>
> ---
>  src/rpc/virnettlscontext.c | 10 +++++++++-
>  1 file changed, 9 insertions(+), 1 deletion(-)
> 
> diff --git a/src/rpc/virnettlscontext.c b/src/rpc/virnettlscontext.c
> index 72e9ed9..7b5d578 100644
> --- a/src/rpc/virnettlscontext.c
> +++ b/src/rpc/virnettlscontext.c
> @@ -707,6 +707,12 @@ static virNetTLSContextPtr virNetTLSContextNew(const char *cacert,
>  
>      err = gnutls_certificate_allocate_credentials(&ctxt->x509cred);
>      if (err) {
> +       /* gnutls_certificate_credentials_t is complex structure with multiple
> +        * internal memory allocatons that can go wrong, so make sure that
> +        * reference is NULL.
> +        */

I changd this comment to

        /* While gnutls_certificate_credentials_t will free any
         * partially allocated credentials struct, it does not
         * set the returned pointer back to NULL after it is
         * freed in an error path.
         */


and then pushed the fix


Regards,
Daniel
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