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| author | J. Bruce Fields <bfields@redhat.com> | 2014-03-20 21:20:26 -0400 |
|---|---|---|
| committer | J. Bruce Fields <bfields@redhat.com> | 2014-05-30 17:32:04 -0400 |
| commit | 3b299709091befc0e02aa33d55ddd5baef006853 (patch) | |
| tree | 2d514a4417d20b1a374d8d862ecc787ea0543936 /fs/nfsd/nfs4xdr.c | |
| parent | 561f0ed498ca4342573a870779cc645d3fd7dfe7 (diff) | |
| download | linux-next-3b299709091befc0e02aa33d55ddd5baef006853.tar.gz | |
nfsd4: enforce rd_dircount
As long as we're here, let's enforce the protocol's limit on the number
of directory entries to return in a readdir.
I don't think anyone's ever noticed our lack of enforcement, but maybe
there's more of a chance they will now that we allow larger readdirs.
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, 4 insertions, 1 deletions
diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c index 4d79e5366a82..3f2a52ccb9d1 100644 --- a/fs/nfsd/nfs4xdr.c +++ b/fs/nfsd/nfs4xdr.c @@ -1033,7 +1033,7 @@ nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *read READ_BUF(24); READ64(readdir->rd_cookie); COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data)); - READ32(readdir->rd_dircount); /* just in case you needed a useless field... */ + READ32(readdir->rd_dircount); READ32(readdir->rd_maxcount); if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval))) goto out; @@ -2720,6 +2720,9 @@ nfsd4_encode_dirent(void *ccdv, const char *name, int namlen, if (entry_bytes > cd->rd_maxcount) goto fail; cd->rd_maxcount -= entry_bytes; + if (!cd->rd_dircount) + goto fail; + cd->rd_dircount--; cd->cookie_offset = cookie_offset; skip_entry: cd->common.err = nfs_ok; |