diff options
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/kvm/emulate.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c index 7226a127ccb4..c58366ae4da2 100644 --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -247,6 +247,9 @@ enum x86_transfer_type { static ulong reg_read(struct x86_emulate_ctxt *ctxt, unsigned nr) { + if (WARN_ON_ONCE(nr >= 16)) + nr &= 16 - 1; + if (!(ctxt->regs_valid & (1 << nr))) { ctxt->regs_valid |= 1 << nr; ctxt->_regs[nr] = ctxt->ops->read_gpr(ctxt, nr); @@ -256,6 +259,9 @@ static ulong reg_read(struct x86_emulate_ctxt *ctxt, unsigned nr) static ulong *reg_write(struct x86_emulate_ctxt *ctxt, unsigned nr) { + if (WARN_ON_ONCE(nr >= 16)) + nr &= 16 - 1; + ctxt->regs_valid |= 1 << nr; ctxt->regs_dirty |= 1 << nr; return &ctxt->_regs[nr]; |