From: Yufeng Wang <wangyufeng@kylinos.cn>
Date: Tue, 17 Mar 2026 11:47:59 +0000 (+0800)
Subject: riscv: kvm: add null pointer check for vector datap
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=9b33ab1e8c189bd0aced0d07545b0f31a459d40e;p=thirdparty%2Fkernel%2Fstable.git

riscv: kvm: add null pointer check for vector datap

Add WARN_ON check before accessing cntx->vector.datap in
kvm_riscv_vcpu_vreg_addr() to detect potential null pointer
dereferences early, consistent with the pattern used in
kvm_riscv_vcpu_vector_reset().

This helps catch initialization issues where vector context
allocation may have failed.

Signed-off-by: Yufeng Wang <wangyufeng@kylinos.cn>
Reviewed-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/20260317114759.53165-1-r4o5m6e8o@163.com
Signed-off-by: Anup Patel <anup@brainfault.org>
---

diff --git a/arch/riscv/kvm/vcpu_vector.c b/arch/riscv/kvm/vcpu_vector.c
index 5b6ad82d47be..f3f5fb665cf6 100644
--- a/arch/riscv/kvm/vcpu_vector.c
+++ b/arch/riscv/kvm/vcpu_vector.c
@@ -130,6 +130,7 @@ static int kvm_riscv_vcpu_vreg_addr(struct kvm_vcpu *vcpu,
 	} else if (reg_num <= KVM_REG_RISCV_VECTOR_REG(31)) {
 		if (reg_size != vlenb)
 			return -EINVAL;
+		WARN_ON(!cntx->vector.datap);
 		*reg_addr = cntx->vector.datap +
 			    (reg_num - KVM_REG_RISCV_VECTOR_REG(0)) * vlenb;
 	} else {