nfsd4: fix encoding of out-of-space replies
If nfsd4_check_resp_size() returns an error then we should really be truncating the reply here, otherwise we may leave extra garbage at the end of the rpc reply. Also add a warning to catch any cases where our reply-size estimates may be wrong in the case of a non-idempotent operation. Signed-off-by: J. Bruce Fields <bfields@redhat.com>
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@ -1171,9 +1171,7 @@ struct nfsd4_operation {
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static struct nfsd4_operation nfsd4_ops[];
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#ifdef NFSD_DEBUG
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static const char *nfsd4_op_name(unsigned opnum);
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#endif
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/*
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* Enforce NFSv4.1 COMPOUND ordering rules:
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@ -1859,14 +1857,21 @@ static struct nfsd4_operation nfsd4_ops[] = {
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},
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};
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#ifdef NFSD_DEBUG
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void warn_on_nonidempotent_op(struct nfsd4_op *op)
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{
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if (OPDESC(op)->op_flags & OP_MODIFIES_SOMETHING) {
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pr_err("unable to encode reply to nonidempotent op %d (%s)\n",
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op->opnum, nfsd4_op_name(op->opnum));
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WARN_ON_ONCE(1);
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}
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}
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static const char *nfsd4_op_name(unsigned opnum)
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{
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if (opnum < ARRAY_SIZE(nfsd4_ops))
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return nfsd4_ops[opnum].op_name;
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return "unknown_operation";
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}
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#endif
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#define nfsd4_voidres nfsd4_voidargs
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struct nfsd4_voidargs { int dummy; };
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@ -3637,6 +3637,7 @@ nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
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{
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struct nfs4_stateowner *so = resp->cstate.replay_owner;
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__be32 *statp;
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nfsd4_enc encoder;
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__be32 *p;
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RESERVE_SPACE(8);
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@ -3648,10 +3649,24 @@ nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
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goto status;
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BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
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!nfsd4_enc_ops[op->opnum]);
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op->status = nfsd4_enc_ops[op->opnum](resp, op->status, &op->u);
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encoder = nfsd4_enc_ops[op->opnum];
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op->status = encoder(resp, op->status, &op->u);
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/* nfsd4_check_resp_size guarantees enough room for error status */
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if (!op->status)
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op->status = nfsd4_check_resp_size(resp, 0);
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if (op->status == nfserr_resource ||
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op->status == nfserr_rep_too_big ||
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op->status == nfserr_rep_too_big_to_cache) {
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/*
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* The operation may have already been encoded or
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* partially encoded. No op returns anything additional
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* in the case of one of these three errors, so we can
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* just truncate back to after the status. But it's a
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* bug if we had to do this on a non-idempotent op:
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*/
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warn_on_nonidempotent_op(op);
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resp->xdr.p = statp + 1;
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}
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if (so) {
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so->so_replay.rp_status = op->status;
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so->so_replay.rp_buflen = (char *)resp->xdr.p
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@ -536,6 +536,8 @@ static inline bool nfsd4_last_compound_op(struct svc_rqst *rqstp)
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return argp->opcnt == resp->opcnt;
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}
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void warn_on_nonidempotent_op(struct nfsd4_op *op);
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#define NFS4_SVC_XDRSIZE sizeof(struct nfsd4_compoundargs)
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static inline void
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