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eventfs: Use list_add_tail_rcu() for SRCU-protected children list

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Commit d2603279c7 ("eventfs: Use list_del_rcu() for SRCU protected
list variable") converted the removal side to pair with the
list_for_each_entry_srcu() walker in eventfs_iterate(). The insertion
in eventfs_create_dir() was left as a plain list_add_tail(), which on
weakly-ordered architectures can expose a new entry to the SRCU reader
before its list pointers and fields are observable.

Use list_add_tail_rcu() so the publication pairs with the existing
list_del_rcu() and list_for_each_entry_srcu().

Fixes: 43aa6f97c2 ("eventfs: Get rid of dentry pointers without refcounts")
Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20260418152251.199343-1-devnexen@gmail.com
Signed-off-by: David Carlier <devnexen@gmail.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
David Carlier 2026-04-18 16:22:50 +01:00 committed by Steven Rostedt
parent 43cec30c44
commit f67950b288
1 changed files with 1 additions and 1 deletions
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2
fs/tracefs/event_inode.c
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@ -706,7 +706,7 @@ struct eventfs_inode *eventfs_create_dir(const char *name, struct eventfs_inode
scoped_guard(mutex, &eventfs_mutex) {
if (!parent->is_freed)
list_add_tail(&ei->list, &parent->children);
list_add_tail_rcu(&ei->list, &parent->children);
}
/* Was the parent freed? */
if (list_empty(&ei->list)) {