Paolo Bonzini d56f5136b0 KVM: let kvm_destroy_vm_debugfs clean up vCPU debugfs directories ... After commit 63d0434 ("KVM: x86: move kvm_create_vcpu_debugfs after last failure point") we are creating the pre-vCPU debugfs files after the creation of the vCPU file descriptor. This makes it possible for userspace to reach kvm_vcpu_release before kvm_create_vcpu_debugfs has finished. The vcpu->debugfs_dentry then does not have any associated inode anymore, and this causes a NULL-pointer dereference in debugfs_create_file. The solution is simply to avoid removing the files; they are cleaned up when the VM file descriptor is closed (and that must be after KVM_CREATE_VCPU returns). We can stop storing the dentry in struct kvm_vcpu too, because it is not needed anywhere after kvm_create_vcpu_debugfs returns. Reported-by: syzbot+705f4401d5a93a59b87d@syzkaller.appspotmail.com Fixes: 63d0434837 ("KVM: x86: move kvm_create_vcpu_debugfs after last failure point") Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>		2020-06-04 11:00:54 -04:00
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boot	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2020-05-31 17:48:46 -07:00
configs	arm64: defconfig: add MEDIA_PLATFORM_SUPPORT	2020-05-14 00:14:38 +02:00
crypto	Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6	2020-06-01 12:00:10 -07:00
include	Merge branch 'akpm' (patches from Andrew)	2020-06-03 20:24:15 -07:00
kernel	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next	2020-06-03 16:27:18 -07:00
kvm	KVM: let kvm_destroy_vm_debugfs clean up vCPU debugfs directories	2020-06-04 11:00:54 -04:00
lib	arm64: Reorder the macro arguments in the copy routines	2020-04-29 21:50:01 +01:00
mm	hugetlbfs: remove hugetlb_add_hstate() warning for existing hstate	2020-06-03 20:09:46 -07:00
net	Merge branch 'for-next/bti' into for-next/core	2020-05-28 18:00:51 +01:00
xen	arm64: xen: Use modern annotations for assembly functions	2020-01-09 16:09:42 +00:00
Kbuild	arm64: add arch/arm64/Kbuild	2019-08-21 18:47:15 +01:00
Kconfig	arm64: mm: use ARCH_HAS_DEBUG_WX instead of arch defined	2020-06-03 20:09:50 -07:00
Kconfig.debug	arm64: mm: use ARCH_HAS_DEBUG_WX instead of arch defined	2020-06-03 20:09:50 -07:00
Kconfig.platforms	ARM: SoC updates	2020-04-03 15:02:35 -07:00
Makefile	Merge branch 'for-next/scs' into for-next/core	2020-05-28 18:03:40 +01:00