queue-6.12/x86-hyperv-fix-error-pointer-dereference.patch

From 9e49b394a10d793a248231ea18705e0b9e527bf6 Mon Sep 17 00:00:00 2001
From: Sasha Levin <sashal@kernel.org>
Date: Wed, 18 Feb 2026 13:09:03 -0600
Subject: x86/hyperv: Fix error pointer dereference

From: Ethan Tidmore <ethantidmore06@gmail.com>

[ Upstream commit 705d01c8d78121ee1634bfc602ac4b0ad1438fab ]

The function idle_thread_get() can return an error pointer and is not
checked for it. Add check for error pointer.

Detected by Smatch:
arch/x86/hyperv/hv_vtl.c:126 hv_vtl_bringup_vcpu() error:
'idle' dereferencing possible ERR_PTR()

Fixes: 2b4b90e053a29 ("x86/hyperv: Use per cpu initial stack for vtl context")
Signed-off-by: Ethan Tidmore <ethantidmore06@gmail.com>
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 arch/x86/hyperv/hv_vtl.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/arch/x86/hyperv/hv_vtl.c b/arch/x86/hyperv/hv_vtl.c
index 2510e91b29b08..b135ba5c18710 100644
--- a/arch/x86/hyperv/hv_vtl.c
+++ b/arch/x86/hyperv/hv_vtl.c
@@ -68,7 +68,7 @@ static void hv_vtl_ap_entry(void)
 
 static int hv_vtl_bringup_vcpu(u32 target_vp_index, int cpu, u64 eip_ignored)
 {
-	u64 status;
+	u64 status, rsp, rip;
 	int ret = 0;
 	struct hv_enable_vp_vtl *input;
 	unsigned long irq_flags;
@@ -81,9 +81,11 @@ static int hv_vtl_bringup_vcpu(u32 target_vp_index, int cpu, u64 eip_ignored)
 	struct desc_struct *gdt;
 
 	struct task_struct *idle = idle_thread_get(cpu);
-	u64 rsp = (unsigned long)idle->thread.sp;
+	if (IS_ERR(idle))
+		return PTR_ERR(idle);
 
-	u64 rip = (u64)&hv_vtl_ap_entry;
+	rsp = (unsigned long)idle->thread.sp;
+	rip = (u64)&hv_vtl_ap_entry;
 
 	native_store_gdt(&gdt_ptr);
 	store_idt(&idt_ptr);
-- 
2.51.0