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Message-ID: <95a8beb95aee10b20492dd01813f2da985e31ba9.camel@kernel.org>
Subject: Re: [PATCH] [v2] SUNRPC: fix a memleak in gss_import_v2_context
From: Jeff Layton <jlayton@kernel.org>
To: Zhipeng Lu <alexious@zju.edu.cn>
Cc: Chuck Lever <chuck.lever@oracle.com>, Neil Brown <neilb@suse.de>, Olga
 Kornievskaia <kolga@netapp.com>, Dai Ngo <Dai.Ngo@oracle.com>, Tom Talpey
 <tom@talpey.com>, Trond Myklebust <trond.myklebust@hammerspace.com>, Anna
 Schumaker <anna@kernel.org>, "David S. Miller" <davem@davemloft.net>, Eric
 Dumazet <edumazet@google.com>, Jakub Kicinski <kuba@kernel.org>,  Paolo
 Abeni <pabeni@redhat.com>, Simo Sorce <simo@redhat.com>, Steve Dickson
 <steved@redhat.com>, Kevin Coffman <kwc@citi.umich.edu>,
 linux-nfs@vger.kernel.org, netdev@vger.kernel.org, 
 linux-kernel@vger.kernel.org
Date: Fri, 12 Jan 2024 08:23:39 -0500
In-Reply-To: <20240112084540.3729001-1-alexious@zju.edu.cn>
References: <20240112084540.3729001-1-alexious@zju.edu.cn>
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On Fri, 2024-01-12 at 16:45 +0800, Zhipeng Lu wrote:
> The ctx->mech_used.data allocated by kmemdup is not freed in neither
> gss_import_v2_context nor it only caller radeon_driver_open_kms.


I'm not sure what this has to do with the radeon driver? The changelog
probably needs to be revised.

> Thus, this patch reform the last call of gss_import_v2_context to the
> gss_krb5_import_ctx_v2, preventing the memleak while keepping the return
> formation.
>=20
> Fixes: 47d848077629 ("gss_krb5: handle new context format from gssd")
> Signed-off-by: Zhipeng Lu <alexious@zju.edu.cn>
> ---
> Changelog:
>=20
> v2: add non-error case
> ---
>  net/sunrpc/auth_gss/gss_krb5_mech.c | 11 ++++++++++-
>  1 file changed, 10 insertions(+), 1 deletion(-)
>=20
> diff --git a/net/sunrpc/auth_gss/gss_krb5_mech.c b/net/sunrpc/auth_gss/gs=
s_krb5_mech.c
> index e31cfdf7eadc..5e6f90d73858 100644
> --- a/net/sunrpc/auth_gss/gss_krb5_mech.c
> +++ b/net/sunrpc/auth_gss/gss_krb5_mech.c
> @@ -398,6 +398,7 @@ gss_import_v2_context(const void *p, const void *end,=
 struct krb5_ctx *ctx,
>  	u64 seq_send64;
>  	int keylen;
>  	u32 time32;
> +	int ret;
> =20
>  	p =3D simple_get_bytes(p, end, &ctx->flags, sizeof(ctx->flags));
>  	if (IS_ERR(p))
> @@ -450,8 +451,16 @@ gss_import_v2_context(const void *p, const void *end=
, struct krb5_ctx *ctx,
>  	}
>  	ctx->mech_used.len =3D gss_kerberos_mech.gm_oid.len;
> =20
> -	return gss_krb5_import_ctx_v2(ctx, gfp_mask);
> +	ret =3D gss_krb5_import_ctx_v2(ctx, gfp_mask);
> +	if (ret) {
> +		p =3D ERR_PTR(ret);
> +		goto out_free;
> +	};
> =20
> +	return 0;
> +
> +out_free:
> +	kfree(ctx->mech_used.data);
>  out_err:
>  	return PTR_ERR(p);
>  }

Nice catch!

Reviewed-by: Jeff Layton <jlayton@kernel.org>