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[92.21.50.228]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-493e0f294a6sm153839565e9.1.2026.07.07.12.49.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 07 Jul 2026 12:49:38 -0700 (PDT) Date: Tue, 7 Jul 2026 20:49:36 +0100 From: David Laight To: Cc: , , , , , Wenpeng Liang , Jason Gunthorpe , Leon Romanovsky , Xi Wang , Weihang Li , , Subject: Re: [PATCH] RDMA/hns: Fix arithmetic overflow in hns_roce_v2_set_hem() Message-ID: <20260707204936.6a8e5c35@pumpkin> In-Reply-To: <20260707140938.3106919-1-Alexander.Chesnokov@kaspersky.com> References: <20260707140938.3106919-1-Alexander.Chesnokov@kaspersky.com> X-Mailer: Claws Mail 4.1.1 (GTK 3.24.38; arm-unknown-linux-gnueabihf) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Tue, 7 Jul 2026 17:09:38 +0300 wrote: > From: Alexander Chesnokov > > If hop_num is 2 or 1, then the expressions like > i * chunk_ba_num + j are computed in 32-bit > arithmetic before being assigned to a u64 index field, > which can lead to overflow. > > Cast the first operand to u64 to ensure the arithmetic > is performed in 64-bit. If the values can be 64bit it would be better to just make i/j/k u64. David > > Found by Linux Verification Center (linuxtesting.org) with SVACE. > > Fixes: a81fba28136d ("RDMA/hns: Configure BT BA and BT attribute for the contexts in hip08") > Cc: stable@vger.kernel.org > Signed-off-by: Alexander Chesnokov > --- > drivers/infiniband/hw/hns/hns_roce_hw_v2.c | 6 +++--- > 1 file changed, 3 insertions(+), 3 deletions(-) > > diff --git a/drivers/infiniband/hw/hns/hns_roce_hw_v2.c b/drivers/infiniband/hw/hns/hns_roce_hw_v2.c > index 1c180a6b1c07..b62513b4db09 100644 > --- a/drivers/infiniband/hw/hns/hns_roce_hw_v2.c > +++ b/drivers/infiniband/hw/hns/hns_roce_hw_v2.c > @@ -4257,11 +4257,11 @@ static int hns_roce_v2_set_hem(struct hns_roce_dev *hr_dev, > chunk_ba_num = mhop.bt_chunk_size / 8; > > if (hop_num == 2) { > - hem_idx = i * chunk_ba_num * chunk_ba_num + j * chunk_ba_num + > + hem_idx = (u64)i * chunk_ba_num * chunk_ba_num + (u64)j * chunk_ba_num + > k; > - l1_idx = i * chunk_ba_num + j; > + l1_idx = (u64)i * chunk_ba_num + j; > } else if (hop_num == 1) { > - hem_idx = i * chunk_ba_num + j; > + hem_idx = (u64)i * chunk_ba_num + j; > } else if (hop_num == HNS_ROCE_HOP_NUM_0) { > hem_idx = i; > }