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[68.61.232.219]) by smtp.gmail.com with ESMTPSA id l22sm2799729qke.118.2020.11.20.12.35.33 for (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Fri, 20 Nov 2020 12:35:33 -0800 (PST) Sender: Chuck Lever Received: from klimt.1015granger.net (klimt.1015granger.net [192.168.1.55]) by gateway.1015granger.net (8.14.7/8.14.7) with ESMTP id 0AKKZWA2029262 for ; Fri, 20 Nov 2020 20:35:32 GMT Subject: [PATCH v2 020/118] NFSD: Replace READ* macros in nfsd4_decode_create() From: Chuck Lever To: linux-nfs@vger.kernel.org Date: Fri, 20 Nov 2020 15:35:32 -0500 Message-ID: <160590453273.1340.8609162090280267676.stgit@klimt.1015granger.net> In-Reply-To: <160590425404.1340.8850646771948736468.stgit@klimt.1015granger.net> References: <160590425404.1340.8850646771948736468.stgit@klimt.1015granger.net> User-Agent: StGit/0.23-29-ga622f1 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-nfs@vger.kernel.org A dedicated decoder for component4 is introduced here, which will be used by other operation decoders in subsequent patches. Signed-off-by: Chuck Lever --- fs/nfsd/nfs4xdr.c | 58 +++++++++++++++++++++++++++++++++++++---------------- 1 file changed, 40 insertions(+), 18 deletions(-) diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c index c7f14f0db432..4a5b7bc21dab 100644 --- a/fs/nfsd/nfs4xdr.c +++ b/fs/nfsd/nfs4xdr.c @@ -90,6 +90,8 @@ check_filename(char *str, int len) if (len == 0) return nfserr_inval; + if (len > NFS4_MAXNAMLEN) + return nfserr_nametoolong; if (isdotent(str, len)) return nfserr_badname; for (i = 0; i < len; i++) @@ -203,6 +205,27 @@ static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes) return ret; } +static __be32 +nfsd4_decode_component4(struct nfsd4_compoundargs *argp, char **namp, u32 *lenp) +{ + __be32 *p, status; + + if (xdr_stream_decode_u32(argp->xdr, lenp) < 0) + return nfserr_bad_xdr; + p = xdr_inline_decode(argp->xdr, *lenp); + if (!p) + return nfserr_bad_xdr; + status = check_filename((char *)p, *lenp); + if (status) + return status; + *namp = svcxdr_tmpalloc(argp, *lenp); + if (!*namp) + return nfserr_jukebox; + memcpy(*namp, p, *lenp); + + return nfs_ok; +} + static __be32 nfsd4_decode_time(struct nfsd4_compoundargs *argp, struct timespec64 *tv) { @@ -643,24 +666,27 @@ nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit static __be32 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create) { - DECODE_HEAD; + __be32 *p, status; - READ_BUF(4); - create->cr_type = be32_to_cpup(p++); + if (xdr_stream_decode_u32(argp->xdr, &create->cr_type) < 0) + return nfserr_bad_xdr; switch (create->cr_type) { case NF4LNK: - READ_BUF(4); - create->cr_datalen = be32_to_cpup(p++); - READ_BUF(create->cr_datalen); + if (xdr_stream_decode_u32(argp->xdr, &create->cr_datalen) < 0) + return nfserr_bad_xdr; + p = xdr_inline_decode(argp->xdr, create->cr_datalen); + if (!p) + return nfserr_bad_xdr; create->cr_data = svcxdr_dupstr(argp, p, create->cr_datalen); if (!create->cr_data) return nfserr_jukebox; break; case NF4BLK: case NF4CHR: - READ_BUF(8); - create->cr_specdata1 = be32_to_cpup(p++); - create->cr_specdata2 = be32_to_cpup(p++); + if (xdr_stream_decode_u32(argp->xdr, &create->cr_specdata1) < 0) + return nfserr_bad_xdr; + if (xdr_stream_decode_u32(argp->xdr, &create->cr_specdata2) < 0) + return nfserr_bad_xdr; break; case NF4SOCK: case NF4FIFO: @@ -668,22 +694,18 @@ nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create default: break; } - - READ_BUF(4); - create->cr_namelen = be32_to_cpup(p++); - READ_BUF(create->cr_namelen); - SAVEMEM(create->cr_name, create->cr_namelen); - if ((status = check_filename(create->cr_name, create->cr_namelen))) + status = nfsd4_decode_component4(argp, &create->cr_name, + &create->cr_namelen); + if (status) return status; - status = nfsd4_decode_fattr4(argp, create->cr_bmval, ARRAY_SIZE(create->cr_bmval), &create->cr_iattr, &create->cr_acl, &create->cr_label, &create->cr_umask); if (status) - goto out; + return status; - DECODE_TAIL; + return nfs_ok; } static inline __be32