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Mon, 6 Apr 2026 02:11:59 -0700 From: Edward Srouji Date: Mon, 6 Apr 2026 12:11:20 +0300 Subject: [PATCH rdma-next v2 09/11] IB/core: Fix IPv6 netlink message size in ib_nl_ip_send_msg() 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="utf-8" Content-Transfer-Encoding: quoted-printable Message-ID: <20260406-security-bug-fixes-v2-9-ee8815fa81b7@nvidia.com> References: <20260406-security-bug-fixes-v2-0-ee8815fa81b7@nvidia.com> In-Reply-To: <20260406-security-bug-fixes-v2-0-ee8815fa81b7@nvidia.com> To: Leon Romanovsky , Jason Gunthorpe , "Chiara Meiohas" , Dennis Dalessandro , Gal Pressman , Mark Bloch , Steve Wise , Mark Zhang , "Neta Ostrovsky" , Patrisious Haddad , "Doug Ledford" , Matan Barak , , Maor Gottlieb CC: , , "Edward Srouji" , Maher Sanalla X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1775466677; l=1480; i=edwards@nvidia.com; s=20251029; h=from:subject:message-id; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: bxGoYT6+VnHHCjx5z+CVj7YaJfB4t/lyiZHA58B5k2onFokwDkwCoVEQ85rCqccjtpZvM/jLSpocAS5AwjkcMYcDg+HjNaIevN3tWZvUdCIGuRbZA6HDGfDsvV0bAG14kMbrXPkUU6/ivs/ZWNIxqn+v7CZoDyopWpMzhKaJuQOgaz1RiC4hLwb0RKuLtJuppn/W5YeO3KSJW8o25j+sOJvco5/wXTduJq5CuGLi89gUe/Ot5bATIOOMTBVz7IV8qC4zGmVj9ZRXfvg3GURf/NLofZsyMMaDXZMZECH23yAuaXLeCUlEmh+0RsImVCyarQvTS6sl8jn+ACVIw1fBtx29mfoensAraJDJbOhqYMjbylBoMFjbwvtAikO27M724AB6W8iAWS3jQ5MfEwfeHKYdZD1PP7pXd4+1HKhFI5TePmOdb+SSDPrU3wFRI+de X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 06 Apr 2026 09:12:15.2114 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: b17cabfd-1da1-42ec-e502-08de93bc986b X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.118.233];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: CH3PEPF00000015.namprd21.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA0PR12MB9047 From: Maher Sanalla When resolving an RDMA-CM IPv6 address, ib_nl_ip_send_msg() sends a netlink request to the userspace daemon to perform IP-to-GID resolution in certain cases. The function allocates the netlink message buffer using nla_total_size(sizeof(size)), which passes 8 bytes (the size of size_t) instead of 16 bytes (the size of an IPv6 address). This results in an 8-byte under-allocation. This is currently masked by nlmsg_new() over-allocation of the skb in its internal logic. However, the code remains incorrect. Fix the issue by supplying the proper IPv6 address length to nla_total_size(). Fixes: ae43f8286730 ("IB/core: Add IP to GID netlink offload") Signed-off-by: Maher Sanalla Reviewed-by: Patrisious Haddad Signed-off-by: Edward Srouji --- drivers/infiniband/core/addr.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/infiniband/core/addr.c b/drivers/infiniband/core/addr.c index 866746695712aeae425100eefb231e44d52d52d4..01c8e8806eebe511b405d17604c= ca28e3ed92571 100644 --- a/drivers/infiniband/core/addr.c +++ b/drivers/infiniband/core/addr.c @@ -150,7 +150,7 @@ static int ib_nl_ip_send_msg(struct rdma_dev_addr *dev_= addr, attrtype =3D RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_IPV6; } =20 - len =3D nla_total_size(sizeof(size)); + len =3D nla_total_size(size); len +=3D NLMSG_ALIGN(sizeof(*header)); =20 skb =3D nlmsg_new(len, GFP_KERNEL); --=20 2.49.0