eventpoll: rename ep_remove_safe() back to ep_remove()

mainline inclusion
from mainline-v7.1-rc1
category: bugfix
CVE: CVE-2026-46242

The current name is just confusing and doesn't clarify anything.

Link: https://patch.msgid.link/20260423-work-epoll-uaf-v1-4-2470f9eec0f5@kernel.org
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
(cherry picked from commit 0bade234723e40e4937be912e105785d6a51464e)
Signed-off-by: Wentao Guan <guanwentao@uniontech.com>

Author: brauner

fs/eventpoll.c

@@ -770,7 +770,7 @@ static bool ep_remove_epi(struct eventpoll *ep, struct epitem *epi)
 /*
  * ep_remove variant for callers owing an additional reference to the ep
  */
-static void ep_remove_safe(struct eventpoll *ep, struct epitem *epi)
+static void ep_remove(struct eventpoll *ep, struct epitem *epi)
 {
 	struct file *file = epi->ffd.file;
 
@@ -817,7 +817,7 @@ static void ep_clear_and_put(struct eventpoll *ep)
 
 	/*
 	 * Walks through the whole tree and try to free each "struct epitem".
-	 * Note that ep_remove_safe() will not remove the epitem in case of a
+	 * Note that ep_remove() will not remove the epitem in case of a
 	 * racing eventpoll_release_file(); the latter will do the removal.
 	 * At this point we are sure no poll callbacks will be lingering around.
 	 * Since we still own a reference to the eventpoll struct, the loop can't
@@ -826,7 +826,7 @@ static void ep_clear_and_put(struct eventpoll *ep)
 	for (rbp = rb_first_cached(&ep->rbr); rbp; rbp = next) {
 		next = rb_next(rbp);
 		epi = rb_entry(rbp, struct epitem, rbn);
-		ep_remove_safe(ep, epi);
+		ep_remove(ep, epi);
 		cond_resched();
 	}
 
@@ -1496,21 +1496,21 @@ static int ep_insert(struct eventpoll *ep, const struct epoll_event *event,
 		mutex_unlock(&tep->mtx);
 
 	/*
-	 * ep_remove_safe() calls in the later error paths can't lead to
+	 * ep_remove() calls in the later error paths can't lead to
 	 * ep_free() as the ep file itself still holds an ep reference.
 	 */
 	ep_get(ep);
 
 	/* now check if we've created too many backpaths */
 	if (unlikely(full_check && reverse_path_check())) {
-		ep_remove_safe(ep, epi);
+		ep_remove(ep, epi);
 		return -EINVAL;
 	}
 
 	if (epi->event.events & EPOLLWAKEUP) {
 		error = ep_create_wakeup_source(epi);
 		if (error) {
-			ep_remove_safe(ep, epi);
+			ep_remove(ep, epi);
 			return error;
 		}
 	}
@@ -1534,7 +1534,7 @@ static int ep_insert(struct eventpoll *ep, const struct epoll_event *event,
 	 * high memory pressure.
 	 */
 	if (unlikely(!epq.epi)) {
-		ep_remove_safe(ep, epi);
+		ep_remove(ep, epi);
 		return -ENOMEM;
 	}
 
@@ -2226,7 +2226,7 @@ int do_epoll_ctl(int epfd, int op, int fd, struct epoll_event *epds,
 			 * The eventpoll itself is still alive: the refcount
 			 * can't go to zero here.
 			 */
-			ep_remove_safe(ep, epi);
+			ep_remove(ep, epi);
 			error = 0;
 		} else {
 			error = -ENOENT;