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authorBryan Schumaker <bjschuma@netapp.com>2011-04-06 14:33:28 -0400
committerTrond Myklebust <Trond.Myklebust@netapp.com>2011-04-06 13:25:04 -0700
commit418875900e3de4831c84f86ae4756690dac5be77 (patch)
treed0609f12b62962806adc092867350b7bfcfed5a3
parent0867659fa3c245bf203d837a82e0f6ea5079c2c5 (diff)
NFS: Fix a signed vs. unsigned secinfo bug
rpc_authflavor_t is cast from an unsigned int, but the initial code tried to use it as a signed int. I fix this by passing an rpc_authflavor_t pointer around, and returning signed integers from functions. Signed-off-by: Bryan Schumaker <bjschuma@netapp.com> Reported-by: Dan Carpenter <error27@gmail.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
-rw-r--r--fs/nfs/namespace.c58
1 files changed, 25 insertions, 33 deletions
diff --git a/fs/nfs/namespace.c b/fs/nfs/namespace.c
index 9166fcb66da..89fc160fd5b 100644
--- a/fs/nfs/namespace.c
+++ b/fs/nfs/namespace.c
@@ -148,67 +148,64 @@ static rpc_authflavor_t nfs_find_best_sec(struct nfs4_secinfo_flavors *flavors,
return pseudoflavor;
}
-static rpc_authflavor_t nfs_negotiate_security(const struct dentry *parent, const struct dentry *dentry)
+static int nfs_negotiate_security(const struct dentry *parent,
+ const struct dentry *dentry,
+ rpc_authflavor_t *flavor)
{
- int status = 0;
struct page *page;
struct nfs4_secinfo_flavors *flavors;
int (*secinfo)(struct inode *, const struct qstr *, struct nfs4_secinfo_flavors *);
- rpc_authflavor_t flavor = RPC_AUTH_UNIX;
+ int ret = -EPERM;
secinfo = NFS_PROTO(parent->d_inode)->secinfo;
if (secinfo != NULL) {
page = alloc_page(GFP_KERNEL);
if (!page) {
- status = -ENOMEM;
+ ret = -ENOMEM;
goto out;
}
flavors = page_address(page);
- status = secinfo(parent->d_inode, &dentry->d_name, flavors);
- flavor = nfs_find_best_sec(flavors, dentry->d_inode);
+ ret = secinfo(parent->d_inode, &dentry->d_name, flavors);
+ *flavor = nfs_find_best_sec(flavors, dentry->d_inode);
put_page(page);
}
- return flavor;
-
out:
- status = -ENOMEM;
- return status;
+ return ret;
}
-static rpc_authflavor_t nfs_lookup_with_sec(struct nfs_server *server, struct dentry *parent,
- struct dentry *dentry, struct path *path,
- struct nfs_fh *fh, struct nfs_fattr *fattr)
+static int nfs_lookup_with_sec(struct nfs_server *server, struct dentry *parent,
+ struct dentry *dentry, struct path *path,
+ struct nfs_fh *fh, struct nfs_fattr *fattr,
+ rpc_authflavor_t *flavor)
{
- rpc_authflavor_t flavor;
struct rpc_clnt *clone;
struct rpc_auth *auth;
int err;
- flavor = nfs_negotiate_security(parent, path->dentry);
- if (flavor < 0)
+ err = nfs_negotiate_security(parent, path->dentry, flavor);
+ if (err < 0)
goto out;
clone = rpc_clone_client(server->client);
- auth = rpcauth_create(flavor, clone);
+ auth = rpcauth_create(*flavor, clone);
if (!auth) {
- flavor = -EIO;
+ err = -EIO;
goto out_shutdown;
}
err = server->nfs_client->rpc_ops->lookup(clone, parent->d_inode,
&path->dentry->d_name,
fh, fattr);
- if (err < 0)
- flavor = err;
out_shutdown:
rpc_shutdown_client(clone);
out:
- return flavor;
+ return err;
}
#else /* CONFIG_NFS_V4 */
-static inline rpc_authflavor_t nfs_lookup_with_sec(struct nfs_server *server,
- struct dentry *parent, struct dentry *dentry,
- struct path *path, struct nfs_fh *fh,
- struct nfs_fattr *fattr)
+static inline int nfs_lookup_with_sec(struct nfs_server *server,
+ struct dentry *parent, struct dentry *dentry,
+ struct path *path, struct nfs_fh *fh,
+ struct nfs_fattr *fattr,
+ rpc_authflavor_t *flavor)
{
return -EPERM;
}
@@ -234,7 +231,7 @@ struct vfsmount *nfs_d_automount(struct path *path)
struct nfs_fh *fh = NULL;
struct nfs_fattr *fattr = NULL;
int err;
- rpc_authflavor_t flavor = 1;
+ rpc_authflavor_t flavor = RPC_AUTH_UNIX;
dprintk("--> nfs_d_automount()\n");
@@ -255,13 +252,8 @@ struct vfsmount *nfs_d_automount(struct path *path)
err = server->nfs_client->rpc_ops->lookup(server->client, parent->d_inode,
&path->dentry->d_name,
fh, fattr);
- if (err == -EPERM) {
- flavor = nfs_lookup_with_sec(server, parent, path->dentry, path, fh, fattr);
- if (flavor < 0)
- err = flavor;
- else
- err = 0;
- }
+ if (err == -EPERM && NFS_PROTO(parent->d_inode)->secinfo != NULL)
+ err = nfs_lookup_with_sec(server, parent, path->dentry, path, fh, fattr, &flavor);
dput(parent);
if (err != 0) {
mnt = ERR_PTR(err);