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| author | Trond Myklebust <Trond.Myklebust@netapp.com> | 2009-09-02 22:48:32 +0200 |
|---|---|---|
| committer | J. Bruce Fields <bfields@citi.umich.edu> | 2009-09-03 22:57:57 +0200 |
| commit | 2671a4bf3516757ca028c139a7902a50f2bd994a (patch) | |
| tree | 9b60719bdd52cdae10f4b64525c13f072e1ac7b0 /fs/nfsd | |
| parent | nfsd: move fsid_type choice out of fh_compose (diff) | |
| download | linux-2671a4bf3516757ca028c139a7902a50f2bd994a.tar.xz linux-2671a4bf3516757ca028c139a7902a50f2bd994a.zip | |
NFSd: Fix filehandle leak in exp_pseudoroot() and nfsd4_path()
nfsd4_path() allocates a temporary filehandle and then fails to free it
before the function exits, leaking reference counts to the dentry and
export that it refers to.
Also, nfsd4_lookupp() puts the result of exp_pseudoroot() in a temporary
filehandle which it releases on success of exp_pseudoroot() but not on
failure; fix exp_pseudoroot to ensure that on failure it releases the
filehandle before returning.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Diffstat (limited to 'fs/nfsd')
| -rw-r--r-- | fs/nfsd/export.c | 2 | ||||
| -rw-r--r-- | fs/nfsd/nfs4xdr.c | 15 |
2 files changed, 12 insertions, 5 deletions
diff --git a/fs/nfsd/export.c b/fs/nfsd/export.c index d9462643155c..984a5ebcc1d6 100644 --- a/fs/nfsd/export.c +++ b/fs/nfsd/export.c @@ -1341,6 +1341,8 @@ exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp) if (rv) goto out; rv = check_nfsd_access(exp, rqstp); + if (rv) + fh_put(fhp); out: exp_put(exp); return rv; diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c index 00ed16a18497..0fbd50cee1f6 100644 --- a/fs/nfsd/nfs4xdr.c +++ b/fs/nfsd/nfs4xdr.c @@ -1599,7 +1599,8 @@ static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location, static char *nfsd4_path(struct svc_rqst *rqstp, struct svc_export *exp, __be32 *stat) { struct svc_fh tmp_fh; - char *path, *rootpath; + char *path = NULL, *rootpath; + size_t rootlen; fh_init(&tmp_fh, NFS4_FHSIZE); *stat = exp_pseudoroot(rqstp, &tmp_fh); @@ -1609,14 +1610,18 @@ static char *nfsd4_path(struct svc_rqst *rqstp, struct svc_export *exp, __be32 * path = exp->ex_pathname; - if (strncmp(path, rootpath, strlen(rootpath))) { + rootlen = strlen(rootpath); + if (strncmp(path, rootpath, rootlen)) { dprintk("nfsd: fs_locations failed;" "%s is not contained in %s\n", path, rootpath); *stat = nfserr_notsupp; - return NULL; + path = NULL; + goto out; } - - return path + strlen(rootpath); + path += rootlen; +out: + fh_put(&tmp_fh); + return path; } /* |