On Aug. 14, 2009, 20:54 +0300, Trond Myklebust <Trond.Myklebust@xxxxxxxxxx> wrote:
> On Fri, 2009-08-14 at 17:19 +0300, Benny Halevy wrote:
>> Signed-off-by: Benny Halevy <bhalevy@xxxxxxxxxxx>
>> ---
>> fs/nfs/nfs4xdr.c | 20 +++++++++++---------
>> 1 files changed, 11 insertions(+), 9 deletions(-)
>>
>> diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
>> index 86e6983..b835dcc 100644
>> --- a/fs/nfs/nfs4xdr.c
>> +++ b/fs/nfs/nfs4xdr.c
>> @@ -3320,17 +3320,19 @@ static int decode_close(struct xdr_stream *xdr, struct nfs_closeres *res)
>> return status;
>> }
>>
>> +static int decode_verifier(struct xdr_stream *xdr, void *verifier)
>> +{
>> + return decode_opaque_fixed(xdr, verifier, 8);
>> +}
>> +
>> static int decode_commit(struct xdr_stream *xdr, struct nfs_writeres *res)
>> {
>> - __be32 *p;
>> int status;
>>
>> status = decode_op_hdr(xdr, OP_COMMIT);
>> - if (status)
>> - return status;
>> - READ_BUF(8);
>> - COPYMEM(res->verf->verifier, 8);
>> - return 0;
>> + if (!status)
>> + status = decode_verifier(xdr, res->verf->verifier);
>> + return status;
>> }
>>
>> static int decode_create(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
>> @@ -3852,10 +3854,10 @@ static int decode_readdir(struct xdr_stream *xdr, struct rpc_rqst *req, struct n
>> int status;
>>
>> status = decode_op_hdr(xdr, OP_READDIR);
>> - if (status)
>> + if (!status)
>> + status = decode_verifier(xdr, readdir->verifier.data);
>> + if (unlikely(status))
>> return status;
>> - READ_BUF(8);
>> - COPYMEM(readdir->verifier.data, 8);
>> dprintk("%s: verifier = %08x:%08x\n",
>> __func__,
>> ((u32 *)readdir->verifier.data)[0],
>
> This introduces an uninitialised variable warning into decode_readdir.
> The fix would be to use xdr->p in the calculation of hdrlen.
>
> I'll add that, no need to resend.
Thanks!
Sadly, I didn't see this warning with gcc 4.4.0 on Fedora 11.
I'm not sure why, but without the -Os (optimize for size) option
it does print the warning. I tried this by manually running the gcc
command "make KBUILD_VERBOSE=1" prints - with and without the -Os option.
Benny
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