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-rw-r--r--kernel/audit_watch.c27
1 files changed, 20 insertions, 7 deletions
diff --git a/kernel/audit_watch.c b/kernel/audit_watch.c
index da8be6d39c1a..b49ab019fdff 100644
--- a/kernel/audit_watch.c
+++ b/kernel/audit_watch.c
@@ -345,7 +345,7 @@ void audit_inotify_unregister(struct list_head *in_list)
}
/* Get path information necessary for adding watches. */
-int audit_get_nd(char *path, struct nameidata **ndp, struct nameidata **ndw)
+static int audit_get_nd(char *path, struct nameidata **ndp, struct nameidata **ndw)
{
struct nameidata *ndparent, *ndwatch;
int err;
@@ -380,7 +380,7 @@ int audit_get_nd(char *path, struct nameidata **ndp, struct nameidata **ndw)
}
/* Release resources used for watch path information. */
-void audit_put_nd(struct nameidata *ndp, struct nameidata *ndw)
+static void audit_put_nd(struct nameidata *ndp, struct nameidata *ndw)
{
if (ndp) {
path_put(&ndp->path);
@@ -426,14 +426,24 @@ static void audit_add_to_parent(struct audit_krule *krule,
/* Find a matching watch entry, or add this one.
* Caller must hold audit_filter_mutex. */
-int audit_add_watch(struct audit_krule *krule, struct nameidata *ndp,
- struct nameidata *ndw)
+int audit_add_watch(struct audit_krule *krule)
{
struct audit_watch *watch = krule->watch;
struct inotify_watch *i_watch;
struct audit_parent *parent;
+ struct nameidata *ndp = NULL, *ndw = NULL;
int ret = 0;
+ mutex_unlock(&audit_filter_mutex);
+
+ /* Avoid calling path_lookup under audit_filter_mutex. */
+ ret = audit_get_nd(watch->path, &ndp, &ndw);
+ if (ret) {
+ /* caller expects mutex locked */
+ mutex_lock(&audit_filter_mutex);
+ goto error;
+ }
+
/* update watch filter fields */
if (ndw) {
watch->dev = ndw->path.dentry->d_inode->i_sb->s_dev;
@@ -445,15 +455,14 @@ int audit_add_watch(struct audit_krule *krule, struct nameidata *ndp,
* inotify watch is found, inotify_find_watch() grabs a reference before
* returning.
*/
- mutex_unlock(&audit_filter_mutex);
-
if (inotify_find_watch(audit_ih, ndp->path.dentry->d_inode,
&i_watch) < 0) {
parent = audit_init_parent(ndp);
if (IS_ERR(parent)) {
/* caller expects mutex locked */
mutex_lock(&audit_filter_mutex);
- return PTR_ERR(parent);
+ ret = PTR_ERR(parent);
+ goto error;
}
} else
parent = container_of(i_watch, struct audit_parent, wdata);
@@ -468,7 +477,11 @@ int audit_add_watch(struct audit_krule *krule, struct nameidata *ndp,
/* match get in audit_init_parent or inotify_find_watch */
put_inotify_watch(&parent->wdata);
+
+error:
+ audit_put_nd(ndp, ndw); /* NULL args OK */
return ret;
+
}
void audit_remove_watch_rule(struct audit_krule *krule, struct list_head *list)