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mcoverlayfs: fix NULL pointer dereference on ovl_dentry_release()

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This commit is contained in:
Yoichi Umezawa
2017-03-28 21:52:41 +09:00
parent f2ab0193e5
commit 4ee0c05e08
3 changed files with 78 additions and 5 deletions
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8
executer/kernel/mcoverlayfs/linux-4.6.7/overlayfs.h
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@@ -43,6 +43,12 @@ enum ovl_opt_bit {
#define OVL_OPT_NOCOPYUPW(opt) ((opt) & __OVL_OPT_NOCOPYUPW)
#define OVL_OPT_NOFSCHECK(opt) ((opt) & __OVL_OPT_NOFSCHECK)
struct ovl_d_fsdata {
struct list_head list;
struct dentry *d;
struct ovl_entry *oe;
};
static inline int ovl_do_rmdir(struct inode *dir, struct dentry *dentry)
{
int err = vfs_rmdir(dir, dentry);
@@ -149,6 +155,8 @@ static inline int ovl_do_whiteout(struct inode *dir, struct dentry *dentry)
unsigned ovl_get_config_opt(struct dentry *dentry);
void ovl_reset_ovl_entry(struct ovl_entry **oe, struct dentry *dentry);
struct ovl_entry *ovl_find_d_fsdata(struct dentry *dentry);
int ovl_add_d_fsdata(struct dentry *dentry);
enum ovl_path_type ovl_path_type(struct dentry *dentry);
u64 ovl_dentry_version_get(struct dentry *dentry);
void ovl_dentry_version_inc(struct dentry *dentry);