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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 56DM7/R0dqV1NyRqnaWdTKi0pKzcf0tpzf88MBepLkerixnR8rQYK1VgMiCUvoEEbY95oP/EMofVv2I+UKE2HTVSxL94+iQauTLqJoLLDLafPdXlLKCHvJu+TqHw4ZQ/pVrEJKaZGx7FSfD4EbK5HElKkVxZosbcV2EiR43Yssxw5SBWRjLGTcobM2TjHSB/zv2t3ysJy8kPzMMRem2Wsi9JJdxCGTbeciIzjwp1mOoe6BK2TqB02pIimi9E4jOVFxeNm8I13RI1DkZNtN2pJf11yklXfvTtmROqxnK6GVy5k603leQXSXSMNANvp/KqdAcAVg8wx4R2gMfhsbh969dhGlpxsFq77OjYazrlgOJdPYU2ZtNN9KBr38YX2H9f2Lq1swDftFNZijlDpDRtV1sNIPnl4Uo53Sa9DGJhryEUrPqIpdkcxwTSI6QzPoy6 X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 09 Nov 2026 14:43:11.5644 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 2f1acab3-5049-4ebe-9a42-08df3e6fc764 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.160];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BN7PEPF000000A7.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CHBPR12MB443627 From: Uri Dar _uverbs_alloc() serves requests that do not fit in the bundle's internal buffer from kvmalloc(), prepending a small list header. The requested size can be derived from userspace input, and since commit 7661809d493b ("mm: don't allow oversized kvmalloc() calls") kvmalloc() WARNs on any request above INT_MAX unless __GFP_NOWARN is given. mlx5 DEVX UMEM registration is one such caller: its CREATE_UMEM mailbox scales with the size of the user's UMEM, and a mailbox that passes the driver's INT_MAX check can still exceed INT_MAX once the header is added. As with memdup_user(), an allocation sized by userspace should fail quietly rather than warn. Pass __GFP_NOWARN so such requests fail with -ENOMEM. Fixes: 461bb2eee4e1 ("IB/uverbs: Add a simple allocator to uverbs_attr_bundle") Signed-off-by: Uri Dar Signed-off-by: Edward Srouji --- drivers/infiniband/core/ib_core_uverbs.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/infiniband/core/ib_core_uverbs.c b/drivers/infiniband/core/ib_core_uverbs.c index 74d9c006bad5aa5d8366b1b75843c9873c62c344..c41b77d7084034613678e8b4b25bc95f72c8e241 100644 --- a/drivers/infiniband/core/ib_core_uverbs.c +++ b/drivers/infiniband/core/ib_core_uverbs.c @@ -554,7 +554,7 @@ __malloc void *_uverbs_alloc(struct uverbs_attr_bundle *bundle, size_t size, if (new_used > pbundle->internal_avail) { struct bundle_alloc_head *buf; - buf = kvmalloc_flex(*buf, data, size, flags); + buf = kvmalloc_flex(*buf, data, size, flags | __GFP_NOWARN); if (!buf) return ERR_PTR(-ENOMEM); buf->next = pbundle->allocated_mem; -- 2.49.0