Re: [PATCH v2] ucount: take the rlimit reference before checking the limit

[Christian Brauner]

On Mon, 19 Oct 2026 14:59:13 -0400, Nickolai Zeldovich wrote:
> inc_rlimit_get_ucounts() takes the reference that pins a ucounts level
> while its rlimit count is non-zero only in the walk whose increment is
> the 0 -> 1 transition, and only after that walk passed the limit check.
> A walk that raises the count from zero and then fails the limit backs
> out without the reference, while a concurrent walk that raised it past
> one keeps its increment and never takes one either:
> 
> [...]

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] ucount: take the rlimit reference before checking the limit
      https://git.kernel.org/vfs/vfs/c/b9742ebcce34