On Mon, Aug 29, 2022 at 01:34:52PM -0700, Andrew Morton wrote:
On Mon, 29 Aug 2022 20:12:48 +0000 Carlos Llamas cmllamas@google.com wrote:
Syzbot reported a couple issues introduced by commit 44e602b4e52f ("binder_alloc: add missing mmap_lock calls when using the VMA"), in which we attempt to acquire the mmap_lock when alloc->vma_vm_mm has not been initialized yet.
This can happen if a binder_proc receives a transaction without having previously called mmap() to setup the binder_proc->alloc space in [1]. Also, a similar issue occurs via binder_alloc_print_pages() when we try to dump the debugfs binder stats file in [2].
Thanks. I assume you'll be merging all these into mainline?
Yes, I believe Greg will pick up these patches into his char-misc tree.
Fixes: 44e602b4e52f ("binder_alloc: add missing mmap_lock calls when using the VMA") Reported-by: syzbot+f7dc54e5be28950ac459@syzkaller.appspotmail.com Reported-by: syzbot+a75ebe0452711c9e56d9@syzkaller.appspotmail.com Cc: stable@vger.kernel.org # v5.15+
44e602b4e52f is only present in 6.0-rcX?
Right, it was just added to the stable queue earlier today: https://lore.kernel.org/all/20220829105814.857786586@linuxfoundation.org/ https://lore.kernel.org/all/20220829105809.855177179@linuxfoundation.org/