Messages in this thread Patch in this message | | | Date | Mon, 16 Jul 2018 02:24:56 -0700 | From | tip-bot for Vitaly Kuznetsov <> | Subject | [tip:x86/hyperv] x86/hyper-v: Check cpumask_to_vpset() return value in hyperv_flush_tlb_others_ex() |
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Commit-ID: 0f0caa52cd4a48a44f6cdc77bf83272bbb450727 Gitweb: https://git.kernel.org/tip/0f0caa52cd4a48a44f6cdc77bf83272bbb450727 Author: Vitaly Kuznetsov <vkuznets@redhat.com> AuthorDate: Mon, 9 Jul 2018 19:40:11 +0200 Committer: Thomas Gleixner <tglx@linutronix.de> CommitDate: Mon, 16 Jul 2018 11:19:48 +0200
x86/hyper-v: Check cpumask_to_vpset() return value in hyperv_flush_tlb_others_ex()
Commit 1268ed0c474a ("x86/hyper-v: Fix the circular dependency in IPI enlightenment") made cpumask_to_vpset() return '-1' when there is a CPU with unknown VP index in the supplied set. This needs to be checked before we pass 'nr_bank' to hypercall.
Fixes: 1268ed0c474a ("x86/hyper-v: Fix the circular dependency in IPI enlightenment") Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Michael Kelley <mikelley@microsoft.com> Cc: "K. Y. Srinivasan" <kys@microsoft.com> Cc: Haiyang Zhang <haiyangz@microsoft.com> Cc: Stephen Hemminger <sthemmin@microsoft.com> Cc: "Michael Kelley (EOSG)" <Michael.H.Kelley@microsoft.com> Cc: devel@linuxdriverproject.org Cc: "H. Peter Anvin" <hpa@zytor.com> Link: https://lkml.kernel.org/r/20180709174012.17429-2-vkuznets@redhat.com
--- arch/x86/hyperv/mmu.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/arch/x86/hyperv/mmu.c b/arch/x86/hyperv/mmu.c index 0d90e515ec98..453d2355cd61 100644 --- a/arch/x86/hyperv/mmu.c +++ b/arch/x86/hyperv/mmu.c @@ -186,6 +186,8 @@ static u64 hyperv_flush_tlb_others_ex(const struct cpumask *cpus, flush->hv_vp_set.format = HV_GENERIC_SET_SPARSE_4K; nr_bank = cpumask_to_vpset(&(flush->hv_vp_set), cpus); + if (nr_bank < 0) + return U64_MAX; /* * We can flush not more than max_gvas with one hypercall. Flush the
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