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Wed, 25 Mar 2026 12:00:51 -0700 From: Edward Srouji Date: Wed, 25 Mar 2026 21:00:08 +0200 Subject: [PATCH rdma-next 08/10] 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: <20260325-security-bug-fixes-v1-8-c8332981ad26@nvidia.com> References: <20260325-security-bug-fixes-v1-0-c8332981ad26@nvidia.com> In-Reply-To: <20260325-security-bug-fixes-v1-0-c8332981ad26@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 , CC: , , "Edward Srouji" , Maher Sanalla X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1774465211; 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: 7KRwZ4Zaqk1+g10wT/S1NkPKQd/+vU3kPrTssEo2tCYpmTofoeNtaq0PXPuW4kX4GAAeX/RBqb2fVD2iu21jOQxf1IdQrwbFNUn+Byyu0B7Hj4lmNHBbfpK2XwCEWtrqDzRq6Bz99ij/0AYFxC9dnrLjws149AS/W3sbNr1tN58GpdyaMwHo/MxkypI4cEiuxbTesg4iU35xzZUmiralYU4s0eisb9/FmUMW5nSxYWEUrNwyNc14tKDSX3MbNr0IoYWgpO69mbeTKtJka7UXY9XoaJW9OdDUMaNQvDKytJLHvc//cvhJRCrQfDkOJRDMLLb4ege9cVlNaH8QZzlpdKa1boI72zUfJwnGaU09e/sSo70+0vAKFGe7W0LKtV/EaXOaCsJ+TytKnoFyQNlcJAqIh0NogpQEbcEtGT+MKV5/UECgNt5NkyxyRezrb8cn X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 25 Mar 2026 19:01:15.8816 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 6263c538-dc3c-4a3b-eef9-08de8aa0e423 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.161];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: CY4PEPF0000EE33.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH8PR12MB7421 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