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s=k20201202; t=1706202125; bh=lejBxHhdUHd+Q1+cqI79BaMSvzB+SWkQzYDEux+kZvA=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=bLPZ5OAEyLTwgsG/UVjmp0mNRwAUZqPjGqc2wh8njp/Dcdk4B8SAFX8PfmaJn5n1+ Nc7q/F3CH97Q6Uz+fva0Yjiuq8Nuw1tE1lifKKJaV2usuact4uP+IPsWf7bfeOb2dC 4+Nz40HSFxkcVVKkJykXLrFaEGocl/RqVC8KRU4Gg1P6pXIr6ZCUO1QFSe3566GFWI rhg8QymNVIOVrXrWgzETf6W+QCYRdPu8btfCR/CADTvTgCiemq10lCKrK+1LE0MOb0 TGLniPmPD6wGeuExGQLuootvxgesac21lcsxPOWzp0u3dtpmn4U0OG3FxuqcT46PBi l2MU5LBHcs+TA== Message-ID: <58465d301b0378bd2e5d0a94d5e225ca4a34ae7b.camel@kernel.org> Subject: Re: [PATCH] NFSD: fix LISTXATTRS returning more bytes than maxcount From: Jeff Layton To: Jorge Mora , linux-nfs@vger.kernel.org Cc: chuck.lever@oracle.com Date: Thu, 25 Jan 2024 12:02:03 -0500 In-Reply-To: <20240125144223.12725-1-mora@netapp.com> References: <20240125144223.12725-1-mora@netapp.com> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; 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kZWuOsJdJQdmwlWC5L5ln9xgfr/4mOY38B0U= Content-Type: text/plain; charset="ISO-8859-15" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.50.3 (3.50.3-1.fc39) Precedence: bulk X-Mailing-List: linux-nfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Thu, 2024-01-25 at 07:42 -0700, Jorge Mora wrote: > The maxcount is the maximum number of bytes for the LISTXATTRS4resok > result. This includes the cookie and the count for the name array, > thus subtract 12 bytes from the maxcount: 8 (cookie) + 4 (array count) > when filling up the name array. >=20 > Fixes: 23e50fe3a5e6 ("nfsd: implement the xattr functions and en/decode l= ogic") > Signed-off-by: Jorge Mora > --- > fs/nfsd/nfs4xdr.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) >=20 > diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c > index 92c7dde148a4..17e6404f4296 100644 > --- a/fs/nfsd/nfs4xdr.c > +++ b/fs/nfsd/nfs4xdr.c > @@ -5168,7 +5168,8 @@ nfsd4_encode_listxattrs(struct nfsd4_compoundres *r= esp, __be32 nfserr, > sp =3D listxattrs->lsxa_buf; > nuser =3D 0; > =20 > - xdrleft =3D listxattrs->lsxa_maxcount; > + /* Bytes left is maxcount - 8 (cookie) - 4 (array count) */ > + xdrleft =3D listxattrs->lsxa_maxcount - 12; > =20 > while (left > 0 && xdrleft > 0) { > slen =3D strlen(sp); Nice catch! Reviewed-by: Jeff Layton