Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
eventpoll: use hlist_is_singular_node() in __ep_remove()
Replace the open-coded "epi is the only entry in file->f_ep" check
with hlist_is_singular_node(). Same semantics, and the helper avoids
the head-cacheline access in the common false case.
Link: https://patch.msgid.link/20260423-work-epoll-uaf-v1-1-2470f9eec0f5@kernel.org
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
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-1
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-1
fs/eventpoll.c
+1
-1
fs/eventpoll.c
···
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to_free = NULL;
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head = file->f_ep;
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-
if (head->first == &epi->fllink && !epi->fllink.next) {
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+
if (hlist_is_singular_node(&epi->fllink, head)) {
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/* See eventpoll_release() for details. */
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WRITE_ONCE(file->f_ep, NULL);
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if (!is_file_epoll(file)) {