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authorTrond Myklebust <trond.myklebust@primarydata.com>2016-09-20 20:34:24 +0200
committerAnna Schumaker <Anna.Schumaker@Netapp.com>2016-09-22 23:02:03 +0200
commit78d04af4995a1358039f4406bd31c28faedfa030 (patch)
treee46c10072ed05e4a24dc168bd95f8be5f60f3a3d /fs/nfs
parentnfs: allow blocking locks to be awoken by lock callbacks (diff)
downloadlinux-78d04af4995a1358039f4406bd31c28faedfa030.tar.xz
linux-78d04af4995a1358039f4406bd31c28faedfa030.zip
NFS: nfs_prime_dcache must validate the filename
Before we try to stash it in the dcache, we need to at least check that the filename passed to us by the server is non-empty and doesn't contain any illegal '\0' or '/' characters. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Diffstat (limited to 'fs/nfs')
-rw-r--r--fs/nfs/dir.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index 177fefb26c18..eb095f77c39d 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -496,6 +496,14 @@ void nfs_prime_dcache(struct dentry *parent, struct nfs_entry *entry)
return;
if (!(entry->fattr->valid & NFS_ATTR_FATTR_FSID))
return;
+ if (filename.len == 0)
+ return;
+ /* Validate that the name doesn't contain any illegal '\0' */
+ if (strnlen(filename.name, filename.len) != filename.len)
+ return;
+ /* ...or '/' */
+ if (strnchr(filename.name, filename.len, '/'))
+ return;
if (filename.name[0] == '.') {
if (filename.len == 1)
return;