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Wed, 1 Jul 2026 05:28:52 -0700 From: Edward Srouji Date: Wed, 1 Jul 2026 15:28:18 +0300 Subject: [PATCH rdma-next 4/8] RDMA/core: Fix potential use after free in ib_destroy_srq_user() 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: 7bit Message-ID: <20260701-restrack-uaf-fix-resub-v1-4-c660cda4df2a@nvidia.com> References: <20260701-restrack-uaf-fix-resub-v1-0-c660cda4df2a@nvidia.com> In-Reply-To: <20260701-restrack-uaf-fix-resub-v1-0-c660cda4df2a@nvidia.com> To: Jason Gunthorpe , Leon Romanovsky , "Dennis Dalessandro" , Gal Pressman , Steve Wise , Mark Bloch , Neta Ostrovsky , Mark Zhang , Mark Zhang , Majd Dibbiny , Yishai Hadas CC: , , "Edward Srouji" , Patrisious Haddad , "Michael Guralnik" X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1782908915; l=2320; i=edwards@nvidia.com; s=20251029; h=from:subject:message-id; bh=Jvu32SVgro+98Enzm7cCVvzDtkMapOP8jisNcoB1yCI=; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: GCiaX0Bw8m8452x9fPp7uQmk9tPoC2FFj+ejEL2+kfn2gT2pnaPPnsD8jHXhD2KYYqaxONUiXfAkETb1IjnCK9eyZcIzx4Lp2fUbWthHprQE52mh41HozxL/dj01CCg5BCxqPClMgcCPGwNOlRNxFK1rzUBHRuzNp45Gvb+7WZUtd7REIXWt+/Kv/BhjPetlqLjjQ/7gOYSLIdPfD4C8fyvoaFXzBC0Nm2GMiNygjJ7cItA3nh09X2uQYwtv2Rv+i/4GDSvuyE7sEThZ8S24LVlpV/e8tjlZZv6My4ukjXUb30YxFYqDbtzzT73Iz2YSKLv7ai8VX8tEaUuFyf6IAvK+r6kINuaTQuaEPVbLLOwtlmkd2D295iwQE3026HGC1TAl0X2HkhODS+6X0pBhj796ufVT94vl1sPlwwzxQVW0ElyBQp3eV6NLxwumaXSk X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 01 Jul 2026 12:29:12.3725 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: fe03122e-f322-4853-ec70-08ded76c5b8e 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: BL02EPF0001A107.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA1PR12MB8520 From: Patrisious Haddad When accessing a SRQ via the netlink path the only synchronization mechanism for the said SRQ is rdma_restrack_get(). Currently, rdma_restrack_del() is invoked at the end of ib_destroy_srq_user(), which is too late, since by that point vendor-specific resources associated with the SRQ might already be freed. This can leave a short window where the SRQ remains accessible through restrack, leading to a potential use-after-free. Fix this by moving the rdma_restrack_begin_del() call to the start of ib_destroy_srq_user(), ensuring that the SRQ is removed from restrack before its internal resources are released. This guarantees that no new users hold references to a SRQ that is in the process of destruction. In addition, this change preserves the intended inverted order between create and destroy routines: resources are added to restrack at the end of successful creation, and hence shall be removed from the restrack first thing during the destruction flow, which keeps the lifecycle management consistent and predictable. Fixes: 48f8a70e899f ("RDMA/restrack: Add support to get resource tracking for SRQ") Signed-off-by: Patrisious Haddad Reviewed-by: Michael Guralnik Signed-off-by: Edward Srouji --- drivers/infiniband/core/verbs.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/infiniband/core/verbs.c b/drivers/infiniband/core/verbs.c index 568cb71da726a61997149e92aa570e0bcb76926c..bfbc25dee95d031f91ffef5389e81faa08170719 100644 --- a/drivers/infiniband/core/verbs.c +++ b/drivers/infiniband/core/verbs.c @@ -1140,16 +1140,20 @@ int ib_destroy_srq_user(struct ib_srq *srq, struct ib_udata *udata) if (atomic_read(&srq->usecnt)) return -EBUSY; + rdma_restrack_begin_del(&srq->res); + ret = srq->device->ops.destroy_srq(srq, udata); - if (ret) + if (ret) { + rdma_restrack_abort_del(&srq->res); return ret; + } atomic_dec(&srq->pd->usecnt); if (srq->srq_type == IB_SRQT_XRC && srq->ext.xrc.xrcd) atomic_dec(&srq->ext.xrc.xrcd->usecnt); if (ib_srq_has_cq(srq->srq_type)) atomic_dec(&srq->ext.cq->usecnt); - rdma_restrack_del(&srq->res); + rdma_restrack_commit_del(&srq->res); kfree(srq); return ret; -- 2.49.0