From 556ae3bb32cabe483375b857dda1322384c57b65 Mon Sep 17 00:00:00 2001 From: Jeff Layton Date: Sun, 21 Mar 2010 12:10:36 -0400 Subject: NFS: don't try to decode GETATTR if DELEGRETURN returned error The reply parsing code attempts to decode the GETATTR response even if the DELEGRETURN portion of the compound returned an error. The GETATTR response won't actually exist if that's the case and we're asking the parser to read past the end of the response. This bug is fairly benign. The parser catches this without reading past the end of the response and decode_getfattr returns -EIO. Earlier kernels however had decode_op_hdr using the READ_BUF macro, and this bug would make this printk pop any time the client got an error from a delegreturn: kernel: decode_op_hdr: reply buffer overflowed in line XXXX More recent kernels seem to have replaced this printk with a dprintk. Signed-off-by: Jeff Layton Signed-off-by: Trond Myklebust --- fs/nfs/nfs4xdr.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'fs') diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c index 4d338be492c..dd17713413a 100644 --- a/fs/nfs/nfs4xdr.c +++ b/fs/nfs/nfs4xdr.c @@ -5552,6 +5552,8 @@ static int nfs4_xdr_dec_delegreturn(struct rpc_rqst *rqstp, __be32 *p, struct nf if (status != 0) goto out; status = decode_delegreturn(&xdr); + if (status != 0) + goto out; decode_getfattr(&xdr, res->fattr, res->server, !RPC_IS_ASYNC(rqstp->rq_task)); out: -- cgit v1.2.3-70-g09d2