/* * Linux WiMAX * Mappping of generic netlink family IDs to net devices * * * Copyright (C) 2005-2006 Intel Corporation * Inaky Perez-Gonzalez * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License version * 2 as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA * 02110-1301, USA. * * * We assign a single generic netlink family ID to each device (to * simplify lookup). * * We need a way to map family ID to a wimax_dev pointer. * * The idea is to use a very simple lookup. Using a netlink attribute * with (for example) the interface name implies a heavier search over * all the network devices; seemed kind of a waste given that we know * we are looking for a WiMAX device and that most systems will have * just a single WiMAX adapter. * * We put all the WiMAX devices in the system in a linked list and * match the generic link family ID against the list. * * By using a linked list, the case of a single adapter in the system * becomes (almost) no overhead, while still working for many more. If * it ever goes beyond two, I'll be surprised. */ #include #include #include #include #include #include "wimax-internal.h" #define D_SUBMODULE id_table #include "debug-levels.h" static DEFINE_SPINLOCK(wimax_id_table_lock); static struct list_head wimax_id_table = LIST_HEAD_INIT(wimax_id_table); /* * wimax_id_table_add - add a gennetlink familiy ID / wimax_dev mapping * * @wimax_dev: WiMAX device descriptor to associate to the Generic * Netlink family ID. * * Look for an empty spot in the ID table; if none found, double the * table's size and get the first spot. */ void wimax_id_table_add(struct wimax_dev *wimax_dev) { d_fnstart(3, NULL, "(wimax_dev %p)\n", wimax_dev); spin_lock(&wimax_id_table_lock); list_add(&wimax_dev->id_table_node, &wimax_id_table); spin_unlock(&wimax_id_table_lock); d_fnend(3, NULL, "(wimax_dev %p)\n", wimax_dev); } /* * wimax_get_netdev_by_info - lookup a wimax_dev from the gennetlink info * * The generic netlink family ID has been filled out in the * nlmsghdr->nlmsg_type field, so we pull it from there, look it up in * the mapping table and reference the wimax_dev. * * When done, the reference should be dropped with * 'dev_put(wimax_dev->net_dev)'. */ struct wimax_dev *wimax_dev_get_by_genl_info( struct genl_info *info, int ifindex) { struct wimax_dev *wimax_dev = NULL; d_fnstart(3, NULL, "(info %p ifindex %d)\n", info, ifindex); spin_lock(&wimax_id_table_lock); list_for_each_entry(wimax_dev, &wimax_id_table, id_table_node) { if (wimax_dev->net_dev->ifindex == ifindex) { dev_hold(wimax_dev->net_dev); goto found; } } wimax_dev = NULL; d_printf(1, NULL, "wimax: no devices found with ifindex %d\n", ifindex); found: spin_unlock(&wimax_id_table_lock); d_fnend(3, NULL, "(info %p ifindex %d) = %p\n", info, ifindex, wimax_dev); return wimax_dev; } /* * wimax_id_table_rm - Remove a gennetlink familiy ID / wimax_dev mapping * * @id: family ID to remove from the table */ void wimax_id_table_rm(struct wimax_dev *wimax_dev) { spin_lock(&wimax_id_table_lock); list_del_init(&wimax_dev->id_table_node); spin_unlock(&wimax_id_table_lock); } /* * Release the gennetlink family id / mapping table * * On debug, verify that the table is empty upon removal. We want the * code always compiled, to ensure it doesn't bit rot. It will be * compiled out if CONFIG_BUG is disabled. */ void wimax_id_table_release(void) { struct wimax_dev *wimax_dev; #ifndef CONFIG_BUG return; #endif spin_lock(&wimax_id_table_lock); list_for_each_entry(wimax_dev, &wimax_id_table, id_table_node) { pr_err("BUG: %s wimax_dev %p ifindex %d not cleared\n", __func__, wimax_dev, wimax_dev->net_dev->ifindex); WARN_ON(1); } spin_unlock(&wimax_id_table_lock); } alue='8'>8space:mode:
authorMaarten Lankhorst <maarten.lankhorst@linux.intel.com>2017-01-31 10:25:25 +0100
committerDaniel Vetter <daniel.vetter@ffwll.ch>2017-01-31 13:41:46 +0100
commit92c715fca907686f5298220ece53423e38ba3aed (patch)
tree286158fdad04c9b54955350abb95d4f1c0dc860a /tools/perf/Documentation/jitdump-specification.txt
parente6e7b48b295afa5a5ab440de0a94d9ad8b3ce2d0 (diff)
drm/atomic: Fix double free in drm_atomic_state_default_clear
drm_atomic_helper_page_flip and drm_atomic_ioctl set their own events in crtc_state->event. But when it's set the event is freed in 2 places. Solve this by only freeing the event in the atomic ioctl when it allocated its own event. This has been broken twice. The first time when the code was introduced, but only in the corner case when an event is allocated, but more crtc's were included by atomic check and then failing. This can mostly happen when you do an atomic modeset in i915 and the display clock is changed, which forces all crtc's to be included to the state. This has been broken worse by adding in-fences support, which caused the double free to be done unconditionally. [IGT] kms_rotation_crc: starting subtest primary-rotation-180 ============================================================================= BUG kmalloc-128 (Tainted: G U ): Object already free ----------------------------------------------------------------------------- Disabling lock debugging due to kernel taint INFO: Allocated in drm_atomic_helper_setup_commit+0x285/0x2f0 [drm_kms_helper] age=0 cpu=3 pid=1529 ___slab_alloc+0x308/0x3b0 __slab_alloc+0xd/0x20 kmem_cache_alloc_trace+0x92/0x1c0 drm_atomic_helper_setup_commit+0x285/0x2f0 [drm_kms_helper] intel_atomic_commit+0x35/0x4f0 [i915] drm_atomic_commit+0x46/0x50 [drm] drm_mode_atomic_ioctl+0x7d4/0xab0 [drm] drm_ioctl+0x2b3/0x490 [drm] do_vfs_ioctl+0x69c/0x700 SyS_ioctl+0x4e/0x80 entry_SYSCALL_64_fastpath+0x13/0x94 INFO: Freed in drm_event_cancel_free+0xa3/0xb0 [drm] age=0 cpu=3 pid=1529 __slab_free+0x48/0x2e0 kfree+0x159/0x1a0 drm_event_cancel_free+0xa3/0xb0 [drm] drm_mode_atomic_ioctl+0x86d/0xab0 [drm] drm_ioctl+0x2b3/0x490 [drm] do_vfs_ioctl+0x69c/0x700 SyS_ioctl+0x4e/0x80 entry_SYSCALL_64_fastpath+0x13/0x94 INFO: Slab 0xffffde1f0997b080 objects=17 used=2 fp=0xffff92fb65ec2578 flags=0x200000000008101 INFO: Object 0xffff92fb65ec2578 @offset=1400 fp=0xffff92fb65ec2ae8 Redzone ffff92fb65ec2570: bb bb bb bb bb bb bb bb ........ Object ffff92fb65ec2578: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff92fb65ec2588: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff92fb65ec2598: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff92fb65ec25a8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff92fb65ec25b8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff92fb65ec25c8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff92fb65ec25d8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff92fb65ec25e8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b a5 kkkkkkkkkkkkkkk. Redzone ffff92fb65ec25f8: bb bb bb bb bb bb bb bb ........ Padding ffff92fb65ec2738: 5a 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZ CPU: 3 PID: 180 Comm: kworker/3:2 Tainted: G BU 4.10.0-rc6-patser+ #5039 Hardware name: /NUC5PPYB, BIOS PYBSWCEL.86A.0031.2015.0601.1712 06/01/2015 Workqueue: events intel_atomic_helper_free_state [i915] Call Trace: dump_stack+0x4d/0x6d print_trailer+0x20c/0x220 free_debug_processing+0x1c6/0x330 ? drm_atomic_state_default_clear+0xf7/0x1c0 [drm] __slab_free+0x48/0x2e0 ? drm_atomic_state_default_clear+0xf7/0x1c0 [drm] kfree+0x159/0x1a0 drm_atomic_state_default_clear+0xf7/0x1c0 [drm] ? drm_atomic_state_clear+0x30/0x30 [drm] intel_atomic_state_clear+0xd/0x20 [i915] drm_atomic_state_clear+0x1a/0x30 [drm] __drm_atomic_state_free+0x13/0x60 [drm] intel_atomic_helper_free_state+0x5d/0x70 [i915] process_one_work+0x260/0x4a0 worker_thread+0x2d1/0x4f0 kthread+0x127/0x130 ? process_one_work+0x4a0/0x4a0 ? kthread_stop+0x120/0x120 ret_from_fork+0x29/0x40 FIX kmalloc-128: Object at 0xffff92fb65ec2578 not freed Fixes: 3b24f7d67581 ("drm/atomic: Add struct drm_crtc_commit to track async updates") Fixes: 9626014258a5 ("drm/fence: add in-fences support") Cc: <stable@vger.kernel.org> # v4.8+ Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> Reviewed-by: Gustavo Padovan <gustavo.padovan@collabora.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: http://patchwork.freedesktop.org/patch/msgid/1485854725-27640-1-git-send-email-maarten.lankhorst@linux.intel.com
Diffstat (limited to 'tools/perf/Documentation/jitdump-specification.txt')