From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 71BB3255E47 for ; Mon, 10 Feb 2025 17:23:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1739208189; cv=none; b=eAyekjg7vA883xPcyk0gvUugOOKbYvOxLE9Foo7lcZsEh3SdLjTvp0ciuUexSK7Qjluu1H45q9R2jD7TOObHCa77F87dkwKNsJhWQcKWswG00H89bhqJghIssMj3kZtWz9gDYr6u+ySAt8jVmqovmYQ+ZxCQyFetIwBzfO+AXDc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1739208189; c=relaxed/simple; bh=vrJ16Z6L09QUEvuBJF6oy3GMhu4bEcH+aYAMJk87jeA=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=u4AwRXpZR/CXbXNkOPYDNV4nhiIsFaObghFkPzePLQkryg8FLWAx+6DOA1O309EK1Zz2UfinewnLbDxLA3lXiUlCCozYRN7f60Kaj1PqA9oVUfff0hwhb17Pu/3ob5uA7jwfE1ffqoIEeb342x7Dnq0chfLVx8lNIgoWlHcGvvE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=lFneTzZ3; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="lFneTzZ3" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B50C0C4CED1; Mon, 10 Feb 2025 17:23:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1739208189; bh=vrJ16Z6L09QUEvuBJF6oy3GMhu4bEcH+aYAMJk87jeA=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=lFneTzZ3Q8UvwExm2eSe+d6Dc13kKixcSUieahdUWw/oK4CRo1e3h9GRic6ScqaXl GnTFZd56xSEquEeVpUj2RCq/Sd7k9VcNMc5+zq8Uuup6FHa1G/0GBXhdQ9b8pUEUEn bHZDd6CJ03pffv0iAQX7eU/L3XHEkBkwhSbJ6havyUXwz2MO/538fhWlNxjk9PNaLU wtsq9FVXMtmMQzDNr7o2u/EUIE4y6OoWQK1ynOW40x5p9AM461ncqHyKcaHBeyaiNm 2GYK0e9RgQ8/3yGewVOLbEVVJdHIvbVqv5bpRybnJPuhoAWku4uBuTAuLPrfiz0J3I v233HrN7RIxbQ== Message-ID: <099cb10ef3399d7ebb9179eb3a6415562d409077.camel@kernel.org> Subject: Re: [PATCH] NFSD: Fix callback decoder status codes From: Jeff Layton To: cel@kernel.org, Neil Brown , Olga Kornievskaia , Dai Ngo , Tom Talpey Cc: linux-nfs@vger.kernel.org, Chuck Lever Date: Mon, 10 Feb 2025 12:23:07 -0500 In-Reply-To: <20250210170332.115051-1-cel@kernel.org> References: <20250210170332.115051-1-cel@kernel.org> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv egyjnSsFt7EGoDjdKqr1TS9syJYFjagYtvWk/UfHlW09X+jOh4vYtfX7iYSx/NfqV3W1D7EDi0PqV T2h6v8i8YqsATFPwO4nuiTmL6I40ZofxVd+9wdRI4Db8yUNA4ZSP2nqLcLtFjClYRBoJvRWvsv4lm 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fs/nfsd/nfs4callback.c implements a callback client. Thus its XDR > decoders are decoding replies, not calls. >=20 > NFS4ERR_BAD_XDR is an on-the-wire status code that reports that the > client sent a corrupted RPC /call/. It's not used as the internal > error code when a /reply/ can't be decoded, since that kind of > failure is never reported to the sender of that RPC message. >=20 > Instead, a reply decoder should return -EIO, as the reply decoders > in the NFS client do. >=20 > Fixes: 6487a13b5c6b ("NFSD: add support for CB_GETATTR callback") > Signed-off-by: Chuck Lever > --- > fs/nfsd/nfs4callback.c | 14 +++++++------- > 1 file changed, 7 insertions(+), 7 deletions(-) >=20 > This is only compile-tested, but I'm thinking of throwing this on > the "for v6.15" pile. >=20 >=20 > diff --git a/fs/nfsd/nfs4callback.c b/fs/nfsd/nfs4callback.c > index 961b1defcb1a..ae4b7b6df47f 100644 > --- a/fs/nfsd/nfs4callback.c > +++ b/fs/nfsd/nfs4callback.c > @@ -101,15 +101,15 @@ static int decode_cb_fattr4(struct xdr_stream *xdr,= uint32_t *bitmap, > =20 > if (bitmap[0] & FATTR4_WORD0_CHANGE) > if (xdr_stream_decode_u64(xdr, &fattr->ncf_cb_change) < 0) > - return -NFSERR_BAD_XDR; > + return -EIO; > if (bitmap[0] & FATTR4_WORD0_SIZE) > if (xdr_stream_decode_u64(xdr, &fattr->ncf_cb_fsize) < 0) > - return -NFSERR_BAD_XDR; > + return -EIO; > if (bitmap[2] & FATTR4_WORD2_TIME_DELEG_ACCESS) { > fattr4_time_deleg_access access; > =20 > if (!xdrgen_decode_fattr4_time_deleg_access(xdr, &access)) > - return -NFSERR_BAD_XDR; > + return -EIO; > fattr->ncf_cb_atime.tv_sec =3D access.seconds; > fattr->ncf_cb_atime.tv_nsec =3D access.nseconds; > =20 > @@ -118,7 +118,7 @@ static int decode_cb_fattr4(struct xdr_stream *xdr, u= int32_t *bitmap, > fattr4_time_deleg_modify modify; > =20 > if (!xdrgen_decode_fattr4_time_deleg_modify(xdr, &modify)) > - return -NFSERR_BAD_XDR; > + return -EIO; > fattr->ncf_cb_mtime.tv_sec =3D modify.seconds; > fattr->ncf_cb_mtime.tv_nsec =3D modify.nseconds; > =20 > @@ -682,15 +682,15 @@ static int nfs4_xdr_dec_cb_getattr(struct rpc_rqst = *rqstp, > if (unlikely(status || cb->cb_status)) > return status; > if (xdr_stream_decode_uint32_array(xdr, bitmap, 3) < 0) > - return -NFSERR_BAD_XDR; > + return -EIO; > if (xdr_stream_decode_u32(xdr, &attrlen) < 0) > - return -NFSERR_BAD_XDR; > + return -EIO; > maxlen =3D sizeof(ncf->ncf_cb_change) + sizeof(ncf->ncf_cb_fsize); > if (bitmap[2] !=3D 0) > maxlen +=3D (sizeof(ncf->ncf_cb_mtime.tv_sec) + > sizeof(ncf->ncf_cb_mtime.tv_nsec)) * 2; > if (attrlen > maxlen) > - return -NFSERR_BAD_XDR; > + return -EIO; > status =3D decode_cb_fattr4(xdr, bitmap, ncf); > return status; > } Reviewed-by: Jeff Layton