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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id p15sm6641206pjb.45.2021.06.16.13.37.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 16 Jun 2021 13:37:46 -0700 (PDT) From: Kees Cook To: Jason Gunthorpe Cc: Kees Cook , Yishai Hadas , Doug Ledford , linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org, linux-hardening@vger.kernel.org Subject: [PATCH] IB/mlx4: Avoid field-overflowing memcpy() Date: Wed, 16 Jun 2021 13:37:44 -0700 Message-Id: <20210616203744.1248551-1-keescook@chromium.org> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-Patch-Hashes: v=1; h=sha256; g=cd8ffb35e914232a0c080415b069a036911d3651; i=IU2NWQYKtuynzfrSLXaQGqkOftycINwXSwyl1Wa7yRs=; m=k4bOsoSdgGMwjhphTNjc12U6ACDoo0QRe0PbNbsxyVs=; p=SbdI3Bt6Us1lKDeHmv3nIAwGJSGvxehinrxYbH9Ls4U= X-Patch-Sig: m=pgp; i=keescook@chromium.org; s=0x0x8972F4DFDC6DC026; b=iQIzBAABCgAdFiEEpcP2jyKd1g9yPm4TiXL039xtwCYFAmDKYRcACgkQiXL039xtwCZSTg/+JGP byL2pf/2hEZdu+eUNionarfCtwpkJF6dD+x7eBbkFdCPcOZSyow7NtwN+157sD9N9gIoyhEFPxMag FaZ3i5Oqa0B4Nyvi/GC2gRK8RtJaQlKxuCSKtc9KsRKeePDUI90CnXiJBy/AmXvUEpVSnl7YCO05r ShMvNuQeW1yC3hWpjlqNNhynPfLImHL/OgmH+vNm8UMoL+6kR+5Z8irreC4y3kp1YtVCpyqWlyp9q UoymG5UMTzG9zUkKcbYcv5akzYFe9upHqU55xC7e/AFuK1dyZsaVGUJVhQLI8HHgJQ9VOs45cgTTl sIPP2rrWjPT3CfjihGNmttjcxM525hi39sWkQvfqOU8satDX+tX1ejxHd7UzXWEzILFkwAX6dzs55 UKwvsiq39Mf3srNxVB4nrlEOltkOtLZTtvMIU3pIgQfFt3O6lvZnZ2lgQ2fTA5nHJlI/EbfF1Dror DWUlkCn5C6oVXIStBIKC6Fx0hOfwLmz7aeri1C9RDP1bO3N3q/iWqhMjjWdRjMzZeK/4zNFdtEJOy HV+u0oPgM+fynHg/LqMWl5G750ogLAZ+AflR4+BI1/v4O+S0BSz3rmXpfA0K+5V0KNYLdh+ANpxV/ bxgJbAf1DNa67TzcNkVPWHsnmf6iLb6eFJHwf9+MhH4+v8zVtJa/z0NwX4VNbbIk= Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org In preparation for FORTIFY_SOURCE performing compile-time and run-time field bounds checking for memcpy(), memmove(), and memset(), avoid intentionally writing across neighboring array fields. Use the ether_addr_copy() helper instead, as already done for smac. Signed-off-by: Kees Cook --- drivers/infiniband/hw/mlx4/qp.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/infiniband/hw/mlx4/qp.c b/drivers/infiniband/hw/mlx4/qp.c index 2ae22bf50016..4a2ef7daaded 100644 --- a/drivers/infiniband/hw/mlx4/qp.c +++ b/drivers/infiniband/hw/mlx4/qp.c @@ -3144,7 +3144,7 @@ static int build_mlx_header(struct mlx4_ib_qp *qp, const struct ib_ud_wr *wr, mlx->sched_prio = cpu_to_be16(pcp); ether_addr_copy(sqp->ud_header.eth.smac_h, ah->av.eth.s_mac); - memcpy(sqp->ud_header.eth.dmac_h, ah->av.eth.mac, 6); + ether_addr_copy(sqp->ud_header.eth.dmac_h, ah->av.eth.mac); memcpy(&ctrl->srcrb_flags16[0], ah->av.eth.mac, 2); memcpy(&ctrl->imm, ah->av.eth.mac + 2, 4); -- 2.25.1