From: Steven Rostedt (Google) Date: Tue, 21 Nov 2023 23:10:07 +0000 (-0500) Subject: eventfs: Make sure that parent->d_inode is locked in creating files/dirs X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=f49f950c217bfb40f11662bab39cb388d41e4cfb;p=linux.git eventfs: Make sure that parent->d_inode is locked in creating files/dirs Since the locking of the parent->d_inode has been moved outside the creation of the files and directories (as it use to be locked via a conditional), add a WARN_ON_ONCE() to the case that it's not locked. Link: https://lkml.kernel.org/r/20231121231112.853962542@goodmis.org Cc: Masami Hiramatsu Cc: Mark Rutland Cc: Andrew Morton Reviewed-by: Josef Bacik Signed-off-by: Steven Rostedt (Google) --- diff --git a/fs/tracefs/event_inode.c b/fs/tracefs/event_inode.c index 590e8176449b9..0b90869fd805c 100644 --- a/fs/tracefs/event_inode.c +++ b/fs/tracefs/event_inode.c @@ -327,6 +327,8 @@ create_file_dentry(struct eventfs_inode *ei, int idx, struct dentry **e_dentry = &ei->d_children[idx]; struct dentry *dentry; + WARN_ON_ONCE(!inode_is_locked(parent->d_inode)); + mutex_lock(&eventfs_mutex); if (ei->is_freed) { mutex_unlock(&eventfs_mutex); @@ -430,6 +432,8 @@ create_dir_dentry(struct eventfs_inode *pei, struct eventfs_inode *ei, { struct dentry *dentry = NULL; + WARN_ON_ONCE(!inode_is_locked(parent->d_inode)); + mutex_lock(&eventfs_mutex); if (pei->is_freed || ei->is_freed) { mutex_unlock(&eventfs_mutex);