On Thu, 27 Feb 2025 11:41:08 -0600, Eric Sandeen wrote: > Currently, watch_queue_set_size() modifies the pipe buffers charged to > user->pipe_bufs without updating the pipe->nr_accounted on the pipe > itself, due to the if (!pipe_has_watch_queue()) test in > pipe_resize_ring(). This means that when the pipe is ultimately freed, > we decrement user->pipe_bufs by something other than what than we had > charged to it, potentially leading to an underflow. This in turn can > cause subsequent too_many_pipe_buffers_soft() tests to fail with -EPERM. > > [...] Applied to the vfs-6.15.misc branch of the vfs/vfs.git tree. Patches in the vfs-6.15.misc 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-6.15.misc [1/1] watch_queue: fix pipe accounting mismatch https://git.kernel.org/vfs/vfs/c/483b7214f602
