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| author | Scott Mayhew <smayhew@redhat.com> | 2018-05-07 15:01:08 +0200 |
|---|---|---|
| committer | J. Bruce Fields <bfields@redhat.com> | 2018-05-07 19:00:48 +0200 |
| commit | 9c2ece6ef67e9d376f32823086169b489c422ed0 (patch) | |
| tree | c5c1af2bae5d17037d0373bd50647b4dad5198b1 /fs/nfsd/nfs4xdr.c | |
| parent | Linux 4.17-rc4 (diff) | |
| download | linux-9c2ece6ef67e9d376f32823086169b489c422ed0.tar.xz linux-9c2ece6ef67e9d376f32823086169b489c422ed0.zip | |
nfsd: restrict rd_maxcount to svc_max_payload in nfsd_encode_readdir
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>
Diffstat (limited to 'fs/nfsd/nfs4xdr.c')
| -rw-r--r-- | fs/nfsd/nfs4xdr.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c index 1d048dd95464..cfe535c286c3 100644 --- a/fs/nfsd/nfs4xdr.c +++ b/fs/nfsd/nfs4xdr.c @@ -3651,7 +3651,8 @@ nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4 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 @@ -3665,7 +3666,7 @@ nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4 /* 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; |