Re: [PATCH] eventpoll: Fix integer overflow in ep_loop_check_proc()

[Christian Brauner]

On Mon, 23 Feb 2026 20:59:33 +0100, Jann Horn wrote:
> If a recursive call to ep_loop_check_proc() hits the `result = INT_MAX`,
> an integer overflow will occur in the calling ep_loop_check_proc() at
> `result = max(result, ep_loop_check_proc(ep_tovisit, depth + 1) + 1)`,
> breaking the recursion depth check.
> 
> Fix it by using a different placeholder value that can't lead to an
> overflow.
> 
> [...]

Applied to the vfs.fixes branch of the vfs/vfs.git tree.
Patches in the vfs.fixes branch should appear in linux-next soon.

Please report any outstanding bugs that were missed during review in a
new review to the original patch series allowing us to drop it.

It's encouraged to provide Acked-bys and Reviewed-bys even though the
patch has now been applied. If possible patch trailers will be updated.

Note that commit hashes shown below are subject to change due to rebase,
trailer updates or similar. If in doubt, please check the listed branch.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git
branch: vfs.fixes

[1/1] eventpoll: Fix integer overflow in ep_loop_check_proc()
      https://git.kernel.org/vfs/vfs/c/fdcfce93073d