On Mon, 17 Mar 2025 17:30:28 -0700, Joanne Koong wrote: > There is a race condition leading to a kernel crash from a null > dereference when attemping to access fc->lock in > fuse_uring_create_queue(). fc may be NULL in the case where another > thread is creating the uring in fuse_uring_create() and has set > fc->ring but has not yet set ring->fc when fuse_uring_create_queue() > reads ring->fc. There is another race condition as well where in > fuse_uring_register(), ring->nr_queues may still be 0 and not yet set > to the new value when we compare qid against it. > > [...] 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] fuse: fix uring race condition for null dereference of fc https://git.kernel.org/vfs/vfs/c/d9ecc77193ca
