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| author | Al Viro <viro@zeniv.linux.org.uk> | 2016-03-24 20:38:43 -0400 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2016-03-27 23:49:22 -0400 |
| commit | 798434bda36e357af9ccaf68a7ba1129658c8332 (patch) | |
| tree | 2dd563e07a00767f65a83201771293508bedd238 /fs | |
| parent | 322ea0bbf3003df17b6253f76e572c37d79a6810 (diff) | |
| download | linux-stable-798434bda36e357af9ccaf68a7ba1129658c8332.tar.gz linux-stable-798434bda36e357af9ccaf68a7ba1129658c8332.tar.bz2 linux-stable-798434bda36e357af9ccaf68a7ba1129658c8332.zip | |
__d_alloc(): treat NULL name as QSTR("/", 1)
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/dcache.c | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/fs/dcache.c b/fs/dcache.c index 32ceae3e6112..3cb98dfd9f96 100644 --- a/fs/dcache.c +++ b/fs/dcache.c @@ -1558,7 +1558,11 @@ struct dentry *__d_alloc(struct super_block *sb, const struct qstr *name) * be overwriting an internal NUL character */ dentry->d_iname[DNAME_INLINE_LEN-1] = 0; - if (name->len > DNAME_INLINE_LEN-1) { + if (unlikely(!name)) { + static const struct qstr anon = QSTR_INIT("/", 1); + name = &anon; + dname = dentry->d_iname; + } else if (name->len > DNAME_INLINE_LEN-1) { size_t size = offsetof(struct external_name, name[1]); struct external_name *p = kmalloc(size + name->len, GFP_KERNEL_ACCOUNT); @@ -1812,9 +1816,7 @@ struct dentry *d_make_root(struct inode *root_inode) struct dentry *res = NULL; if (root_inode) { - static const struct qstr name = QSTR_INIT("/", 1); - - res = __d_alloc(root_inode->i_sb, &name); + res = __d_alloc(root_inode->i_sb, NULL); if (res) d_instantiate(res, root_inode); else @@ -1855,7 +1857,6 @@ EXPORT_SYMBOL(d_find_any_alias); static struct dentry *__d_obtain_alias(struct inode *inode, int disconnected) { - static const struct qstr anonstring = QSTR_INIT("/", 1); struct dentry *tmp; struct dentry *res; unsigned add_flags; @@ -1869,7 +1870,7 @@ static struct dentry *__d_obtain_alias(struct inode *inode, int disconnected) if (res) goto out_iput; - tmp = __d_alloc(inode->i_sb, &anonstring); + tmp = __d_alloc(inode->i_sb, NULL); if (!tmp) { res = ERR_PTR(-ENOMEM); goto out_iput; |