From: Vitaly Kuznetsov Date: Mon, 9 Jul 2018 17:40:11 +0000 (+0200) Subject: x86/hyper-v: Check cpumask_to_vpset() return value in hyperv_flush_tlb_others_ex() X-Git-Tag: v4.19-rc1~199^2~2 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0f0caa52cd4a48a44f6cdc77bf83272bbb450727;p=thirdparty%2Fkernel%2Flinux.git 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 Signed-off-by: Thomas Gleixner Reviewed-by: Michael Kelley Cc: "K. Y. Srinivasan" Cc: Haiyang Zhang Cc: Stephen Hemminger Cc: "Michael Kelley (EOSG)" Cc: devel@linuxdriverproject.org Cc: "H. Peter Anvin" Link: https://lkml.kernel.org/r/20180709174012.17429-2-vkuznets@redhat.com --- diff --git a/arch/x86/hyperv/mmu.c b/arch/x86/hyperv/mmu.c index 0d90e515ec988..453d2355cd61d 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