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authorSteven Rostedt (Google) <rostedt@goodmis.org>2024-02-01 10:34:47 -0500
committerSteven Rostedt (Google) <rostedt@goodmis.org>2024-02-01 11:53:52 -0500
commit5a49f996046ba947466bc7461e4b19c4d1daf978 (patch)
treedc4e4b8c67983cae1a777e7f9b801afd167ba79d /fs/tracefs
parent1389358bb008e7625942846e9f03554319b7fecc (diff)
eventfs: Warn if an eventfs_inode is freed without is_freed being set
There should never be a case where an evenfs_inode is being freed without is_freed being set. Add a WARN_ON_ONCE() if it ever happens. That would mean there was one too many put_ei()s. Link: https://lore.kernel.org/linux-trace-kernel/20240201161616.843551963@goodmis.org Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Cc: Christian Brauner <brauner@kernel.org> Cc: Al Viro <viro@ZenIV.linux.org.uk> Cc: Ajay Kaher <ajay.kaher@broadcom.com> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Diffstat (limited to 'fs/tracefs')
-rw-r--r--fs/tracefs/event_inode.c18
1 files changed, 14 insertions, 4 deletions
diff --git a/fs/tracefs/event_inode.c b/fs/tracefs/event_inode.c
index 515fdace1eea..ca7daee7c811 100644
--- a/fs/tracefs/event_inode.c
+++ b/fs/tracefs/event_inode.c
@@ -73,6 +73,9 @@ enum {
static void release_ei(struct kref *ref)
{
struct eventfs_inode *ei = container_of(ref, struct eventfs_inode, kref);
+
+ WARN_ON_ONCE(!ei->is_freed);
+
kfree(ei->entry_attrs);
kfree_const(ei->name);
kfree_rcu(ei, rcu);
@@ -84,6 +87,14 @@ static inline void put_ei(struct eventfs_inode *ei)
kref_put(&ei->kref, release_ei);
}
+static inline void free_ei(struct eventfs_inode *ei)
+{
+ if (ei) {
+ ei->is_freed = 1;
+ put_ei(ei);
+ }
+}
+
static inline struct eventfs_inode *get_ei(struct eventfs_inode *ei)
{
if (ei)
@@ -679,7 +690,7 @@ struct eventfs_inode *eventfs_create_dir(const char *name, struct eventfs_inode
/* Was the parent freed? */
if (list_empty(&ei->list)) {
- put_ei(ei);
+ free_ei(ei);
ei = NULL;
}
return ei;
@@ -770,7 +781,7 @@ struct eventfs_inode *eventfs_create_events_dir(const char *name, struct dentry
return ei;
fail:
- put_ei(ei);
+ free_ei(ei);
tracefs_failed_creating(dentry);
return ERR_PTR(-ENOMEM);
}
@@ -801,9 +812,8 @@ static void eventfs_remove_rec(struct eventfs_inode *ei, int level)
list_for_each_entry(ei_child, &ei->children, list)
eventfs_remove_rec(ei_child, level + 1);
- ei->is_freed = 1;
list_del(&ei->list);
- put_ei(ei);
+ free_ei(ei);
}
/**