[PATCH -next] KVM: arm64: Fix possible null-ptr-deref in idregs_debug_show

[Gaosheng Cui]

The idregs_debug_show() maybe return nullptr, we need to check desc
before dereference it to avoid possible null pointer dereferences.

Fixes: 410db103f6eb ("KVM: arm64: Make idregs debugfs iterator search sysreg table directly")
Signed-off-by: Gaosheng Cui <cuigaosheng1 at huawei.com>
---
 arch/arm64/kvm/sys_regs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index ff8c4e1b847e..b1c59773b9c0 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -4135,7 +4135,7 @@ static int idregs_debug_show(struct seq_file *s, void *v)
 
 	desc = idregs_debug_find(kvm, kvm->arch.idreg_debugfs_iter);
 
-	if (!desc->name)
+	if (!desc || !desc->name)
 		return 0;
 
 	seq_printf(s, "%20s:\t%016llx\n",
-- 
2.25.1