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NFSD: Replace READ* macros that decode the fattr4 security label attribute

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Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Chuck Lever 2020-11-19 14:05:51 -05:00
parent 1c3eff7ea4
commit dabe91828f
1 changed files with 30 additions and 16 deletions
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46
fs/nfsd/nfs4xdr.c
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@ -324,6 +324,33 @@ nfsd4_decode_acl(struct nfsd4_compoundargs *argp, struct nfs4_acl **acl)
return nfs_ok;
}
static noinline __be32
nfsd4_decode_security_label(struct nfsd4_compoundargs *argp,
struct xdr_netobj *label)
{
u32 lfs, pi, length;
__be32 *p;
if (xdr_stream_decode_u32(argp->xdr, &lfs) < 0)
return nfserr_bad_xdr;
if (xdr_stream_decode_u32(argp->xdr, &pi) < 0)
return nfserr_bad_xdr;
if (xdr_stream_decode_u32(argp->xdr, &length) < 0)
return nfserr_bad_xdr;
if (length > NFS4_MAXLABELLEN)
return nfserr_badlabel;
p = xdr_inline_decode(argp->xdr, length);
if (!p)
return nfserr_bad_xdr;
label->len = length;
label->data = svcxdr_dupstr(argp, p, length);
if (!label->data)
return nfserr_jukebox;
return nfs_ok;
}
static __be32
nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
struct iattr *iattr, struct nfs4_acl **acl,
@ -332,7 +359,6 @@ nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
unsigned int starting_pos;
u32 attrlist4_count;
u32 dummy32;
char *buf;
DECODE_HEAD;
iattr->ia_valid = 0;
@ -440,24 +466,12 @@ nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
return nfserr_bad_xdr;
}
}
label->len = 0;
if (IS_ENABLED(CONFIG_NFSD_V4_SECURITY_LABEL) &&
bmval[2] & FATTR4_WORD2_SECURITY_LABEL) {
READ_BUF(4);
dummy32 = be32_to_cpup(p++); /* lfs: we don't use it */
READ_BUF(4);
dummy32 = be32_to_cpup(p++); /* pi: we don't use it either */
READ_BUF(4);
dummy32 = be32_to_cpup(p++);
READ_BUF(dummy32);
if (dummy32 > NFS4_MAXLABELLEN)
return nfserr_badlabel;
READMEM(buf, dummy32);
label->len = dummy32;
label->data = svcxdr_dupstr(argp, buf, dummy32);
if (!label->data)
return nfserr_jukebox;
status = nfsd4_decode_security_label(argp, label);
if (status)
return status;
}
if (bmval[2] & FATTR4_WORD2_MODE_UMASK) {
if (!umask)