| From | Greg Kroah-Hartman <> | Subject | [PATCH 3.18 80/85] nfsd: restrict rd_maxcount to svc_max_payload in nfsd_encode_readdir | Date | Sun, 1 Jul 2018 18:02:38 +0200 |
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3.18-stable review patch. If anyone has any objections, please let me know.
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From: Scott Mayhew <smayhew@redhat.com>
commit 9c2ece6ef67e9d376f32823086169b489c422ed0 upstream.
nfsd4_readdir_rsize restricts rd_maxcount to svc_max_payload when estimating the size of the readdir reply, but nfsd_encode_readdir restricts it to INT_MAX when encoding the reply. This can result in log messages like "kernel: RPC request reserved 32896 but used 1049444".
Restrict rd_dircount similarly (no reason it should be larger than svc_max_payload).
Signed-off-by: Scott Mayhew <smayhew@redhat.com> Cc: stable@vger.kernel.org Signed-off-by: J. Bruce Fields <bfields@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- fs/nfsd/nfs4xdr.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
--- a/fs/nfsd/nfs4xdr.c +++ b/fs/nfsd/nfs4xdr.c @@ -3358,7 +3358,8 @@ nfsd4_encode_readdir(struct nfsd4_compou nfserr = nfserr_resource; goto err_no_verf; } - maxcount = min_t(u32, readdir->rd_maxcount, INT_MAX); + maxcount = svc_max_payload(resp->rqstp); + maxcount = min_t(u32, readdir->rd_maxcount, maxcount); /* * Note the rfc defines rd_maxcount as the size of the * READDIR4resok structure, which includes the verifier above @@ -3372,7 +3373,7 @@ nfsd4_encode_readdir(struct nfsd4_compou /* RFC 3530 14.2.24 allows us to ignore dircount when it's 0: */ if (!readdir->rd_dircount) - readdir->rd_dircount = INT_MAX; + readdir->rd_dircount = svc_max_payload(resp->rqstp); readdir->xdr = xdr; readdir->rd_maxcount = maxcount;
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