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authorAl Viro <viro@zeniv.linux.org.uk>2013-09-01 16:06:39 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2013-09-03 22:50:28 -0400
commit301f0268b63d1b07268e46f5901fc51d6cac20eb (patch)
treec4a4986ee8e2da49f5f028f416f71697f041ee93 /fs
parentca4e05195dbc25bb0f1d4c70a39e6396115807c9 (diff)
nfsd: racy access to ->d_name in nsfd4_encode_path()
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs')
-rw-r--r--fs/nfsd/nfs4xdr.c14
1 files changed, 8 insertions, 6 deletions
diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index c2a4701d7286..d9454fe5653f 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -1816,10 +1816,7 @@ static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
static __be32 nfsd4_encode_path(const struct path *root,
const struct path *path, __be32 **pp, int *buflen)
{
- struct path cur = {
- .mnt = path->mnt,
- .dentry = path->dentry,
- };
+ struct path cur = *path;
__be32 *p = *pp;
struct dentry **components = NULL;
unsigned int ncomponents = 0;
@@ -1859,14 +1856,19 @@ static __be32 nfsd4_encode_path(const struct path *root,
while (ncomponents) {
struct dentry *dentry = components[ncomponents - 1];
- unsigned int len = dentry->d_name.len;
+ unsigned int len;
+ spin_lock(&dentry->d_lock);
+ len = dentry->d_name.len;
*buflen -= 4 + (XDR_QUADLEN(len) << 2);
- if (*buflen < 0)
+ if (*buflen < 0) {
+ spin_unlock(&dentry->d_lock);
goto out_free;
+ }
WRITE32(len);
WRITEMEM(dentry->d_name.name, len);
dprintk("/%s", dentry->d_name.name);
+ spin_unlock(&dentry->d_lock);
dput(dentry);
ncomponents--;
}