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473dZ59oTvZCDZKuiS8f/54ihZPRRzIIWdL52Ugv2Kc0+EmYlV69qolXX/+AerwruqHkwoBwOHr 9I2nJeLi2c1CnNKX5vw== Hi Greg, On 12/05/26 23:09, Greg Kroah-Hartman wrote: > 6.12-stable review patch. If anyone has any objections, please let me know. > > ------------------ > > From: Osama Abdelkader > > commit b7c958d7c1eb1cb9b2be7b5ee4129fcd66cec978 upstream. > > When the second kzalloc (host_context.vector.datap) fails in > kvm_riscv_vcpu_alloc_vector_context, the first allocation > (guest_context.vector.datap) is leaked. Free it before returning. > > Fixes: 0f4b82579716 ("riscv: KVM: Add vector lazy save/restore support") > Cc: stable@vger.kernel.org > Signed-off-by: Osama Abdelkader > Reviewed-by: Andy Chiu > Link: https://lore.kernel.org/r/20260316151612.13305-1-osama.abdelkader@gmail.com > Signed-off-by: Anup Patel > Signed-off-by: Greg Kroah-Hartman > --- > arch/riscv/kvm/vcpu_vector.c | 5 ++++- > 1 file changed, 4 insertions(+), 1 deletion(-) > > --- a/arch/riscv/kvm/vcpu_vector.c > +++ b/arch/riscv/kvm/vcpu_vector.c > @@ -79,8 +79,11 @@ int kvm_riscv_vcpu_alloc_vector_context( > cntx->vector.vlenb = riscv_v_vsize / 32; > > vcpu->arch.host_context.vector.datap = kzalloc(riscv_v_vsize, GFP_KERNEL); > - if (!vcpu->arch.host_context.vector.datap) > + if (!vcpu->arch.host_context.vector.datap) { > + kfree(vcpu->arch.guest_context.vector.datap); > + vcpu->arch.guest_context.vector.datap = NULL; > return -ENOMEM; > + } I have run an AI assisted backport review and it spotted an issue: I have taken a look and the issues goes like: Upstream does: index 05f3cc2d8e31..5b6ad82d47be 100644 --- a/arch/riscv/kvm/vcpu_vector.c +++ b/arch/riscv/kvm/vcpu_vector.c @@ -76,12 +76,15 @@ void kvm_riscv_vcpu_host_vector_restore(struct kvm_cpu_context *cntx) int kvm_riscv_vcpu_alloc_vector_context(struct kvm_vcpu *vcpu) { vcpu->arch.guest_context.vector.datap = kzalloc(riscv_v_vsize, GFP_KERNEL); if (!vcpu->arch.guest_context.vector.datap) return -ENOMEM; vcpu->arch.host_context.vector.datap = kzalloc(riscv_v_vsize, GFP_KERNEL); - if (!vcpu->arch.host_context.vector.datap) + if (!vcpu->arch.host_context.vector.datap) { + kfree(vcpu->arch.guest_context.vector.datap); + vcpu->arch.guest_context.vector.datap = NULL; return -ENOMEM; + } return 0; So when second allocation fails in the error path, its frees the right object "vcpu->arch.guest_context.vector.datap" but in the backport: diff --git a/arch/riscv/kvm/vcpu_vector.c b/arch/riscv/kvm/vcpu_vector.c index 8454c1c3655a..eaf88c20508a 100644 --- a/arch/riscv/kvm/vcpu_vector.c +++ b/arch/riscv/kvm/vcpu_vector.c @@ -73,14 +73,17 @@ void kvm_riscv_vcpu_host_vector_restore(struct kvm_cpu_context *cntx) int kvm_riscv_vcpu_alloc_vector_context(struct kvm_vcpu *vcpu, struct kvm_cpu_context *cntx) { cntx->vector.datap = kmalloc(riscv_v_vsize, GFP_KERNEL); if (!cntx->vector.datap) return -ENOMEM; cntx->vector.vlenb = riscv_v_vsize / 32; vcpu->arch.host_context.vector.datap = kzalloc(riscv_v_vsize, GFP_KERNEL); - if (!vcpu->arch.host_context.vector.datap) + if (!vcpu->arch.host_context.vector.datap) { + kfree(vcpu->arch.guest_context.vector.datap); + vcpu->arch.guest_context.vector.datap = NULL; return -ENOMEM; + } return 0; } we should have freed "cntx->vector.datap" but frees the same object like upstream. So there is a cleanup target mismatch (cntx->vector.datap allocated, guest_context.vector.datap freed) I think we need to drop this backport. thanks, Harshit > > return 0; > } > > >