b0a2af91cd
commit 941224e09483ea3428ffc6402de56a4a2e2cb6da upstream. When a kernel ULP requests the rdmavt to create a completion queue, it allocated the queue and set cq->kqueue to point to it. However, when the completion queue is destroyed, cq->queue is freed instead, leading to a memory leak: https://lore.kernel.org/r/215235485.15264050.1583334487658.JavaMail.zimbra@redhat.com unreferenced object 0xffffc90006639000 (size 12288): comm "kworker/u128:0", pid 8, jiffies 4295777598 (age 589.085s) hex dump (first 32 bytes): 4d 00 00 00 4d 00 00 00 00 c0 08 ac 8b 88 ff ff M...M........... 00 00 00 00 80 00 00 00 00 00 00 00 10 00 00 00 ................ backtrace: [<0000000035a3d625>] __vmalloc_node_range+0x361/0x720 [<000000002942ce4f>] __vmalloc_node.constprop.30+0x63/0xb0 [<00000000f228f784>] rvt_create_cq+0x98a/0xd80 [rdmavt] [<00000000b84aec66>] __ib_alloc_cq_user+0x281/0x1260 [ib_core] [<00000000ef3764be>] nvme_rdma_cm_handler+0xdb7/0x1b80 [nvme_rdma] [<00000000936b401c>] cma_cm_event_handler+0xb7/0x550 [rdma_cm] [<00000000d9c40b7b>] addr_handler+0x195/0x310 [rdma_cm] [<00000000c7398a03>] process_one_req+0xdd/0x600 [ib_core] [<000000004d29675b>] process_one_work+0x920/0x1740 [<00000000efedcdb5>] worker_thread+0x87/0xb40 [<000000005688b340>] kthread+0x327/0x3f0 [<0000000043a168d6>] ret_from_fork+0x3a/0x50 This patch fixes the issue by freeing cq->kqueue instead. Fixes: 239b0e52d8aa ("IB/hfi1: Move rvt_cq_wc struct into uapi directory") Link: https://lore.kernel.org/r/20200313123957.14343.43879.stgit@awfm-01.aw.intel.com Cc: <stable@vger.kernel.org> # 5.4.x Reported-by: Yi Zhang <yi.zhang@redhat.com> Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com> Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com> Signed-off-by: Kaike Wan <kaike.wan@intel.com> Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.