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([2402:f000:4:1006:809:ffff:fffe:18ea]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-bf6a32deff0sm14144129a12.34.2025.12.08.23.23.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 08 Dec 2025 23:23:29 -0800 (PST) From: Tuo Li To: leon@kernel.org, jgg@ziepe.ca Cc: linux-rdma@vger.kernel.org, linux-kernel@vger.kernel.org, Tuo Li Subject: [PATCH] IB/mlx5: Fix a possible null-pointer dereference in set_roce_addr() Date: Tue, 9 Dec 2025 15:23:05 +0800 Message-ID: <20251209072305.3955121-1-islituo@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The pointer gid is checked at the beginning of set_roce_addr(). However, if it is NULL, the function continues execution and may dereference gid when calling mlx5_core_roce_gid_set(): return mlx5_core_roce_gid_set(..., gid->raw, ...) This can lead to a null-pointer dereference. To prevent this, add an else branch that return -EINVAL when gid is NULL, and remove the redundant gid check in the IB_GID_TYPE_ROCE_UDP_ENCAP case. Signed-off-by: Tuo Li --- drivers/infiniband/hw/mlx5/main.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/infiniband/hw/mlx5/main.c b/drivers/infiniband/hw/mlx5= /main.c index 40284bbb45d6..d68a58d249d4 100644 --- a/drivers/infiniband/hw/mlx5/main.c +++ b/drivers/infiniband/hw/mlx5/main.c @@ -645,6 +645,8 @@ int set_roce_addr(struct mlx5_ib_dev *dev, u32 port_num, ret =3D rdma_read_gid_l2_fields(attr, &vlan_id, &mac[0]); if (ret) return ret; + } else { + return -EINVAL; } =20 switch (gid_type) { @@ -653,7 +655,7 @@ int set_roce_addr(struct mlx5_ib_dev *dev, u32 port_num, break; case IB_GID_TYPE_ROCE_UDP_ENCAP: roce_version =3D MLX5_ROCE_VERSION_2; - if (gid && ipv6_addr_v4mapped((void *)gid)) + if (ipv6_addr_v4mapped((void *)gid)) roce_l3_type =3D MLX5_ROCE_L3_TYPE_IPV4; else roce_l3_type =3D MLX5_ROCE_L3_TYPE_IPV6; --=20 2.43.0