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NFSD: Avoid calling OPDESC() with ops->opnum == OP_ILLEGAL

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OPDESC() simply indexes into nfsd4_ops[] by the op's operation
number, without range checking that value. It assumes callers are
careful to avoid calling it with an out-of-bounds opnum value.

nfsd4_decode_compound() is not so careful, and can invoke OPDESC()
with opnum set to OP_ILLEGAL, which is 10044 -- well beyond the end
of nfsd4_ops[].

Reported-by: Jeff Layton <jlayton@kernel.org>
Fixes: f4f9ef4a1b ("nfsd4: opdesc will be useful outside nfs4proc.c")
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Chuck Lever 2023-03-31 16:31:19 -04:00
parent 5f24a8725f
commit 804d8e0a6e
1 changed files with 3 additions and 1 deletions
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4
fs/nfsd/nfs4xdr.c
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@ -2476,10 +2476,12 @@ nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
for (i = 0; i < argp->opcnt; i++) {
op = &argp->ops[i];
op->replay = NULL;
op->opdesc = NULL;
if (xdr_stream_decode_u32(argp->xdr, &op->opnum) < 0)
return false;
if (nfsd4_opnum_in_range(argp, op)) {
op->opdesc = OPDESC(op);
op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
if (op->status != nfs_ok)
trace_nfsd_compound_decode_err(argp->rqstp,
@ -2490,7 +2492,7 @@ nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
op->opnum = OP_ILLEGAL;
op->status = nfserr_op_illegal;
}
op->opdesc = OPDESC(op);
/*
* We'll try to cache the result in the DRC if any one
* op in the compound wants to be cached: