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List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6602:400f:b0:876:adc1:44e5 with SMTP id ca18e2360f4ac-8795c1f17a9mr35222439f.3.1752019946132; Tue, 08 Jul 2025 17:12:26 -0700 (PDT) Date: Tue, 08 Jul 2025 17:12:26 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <686db3ea.050a0220.1ffab7.0028.GAE@google.com> Subject: [syzbot] [rdma?] KASAN: slab-use-after-free Read in ucma_create_uevent From: syzbot To: jgg@ziepe.ca, leon@kernel.org, linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: d006330be3f7 Merge tag 'sound-6.16-rc6' of git://git.kerne.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=13e4bf70580000 kernel config: https://syzkaller.appspot.com/x/.config?x=8fa6c6703a4b2315 dashboard link: https://syzkaller.appspot.com/bug?extid=a6ffe86390c8a6afc818 compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17e4bf70580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14f6ca8c580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-d006330b.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/d47418563f9c/vmlinux-d006330b.xz kernel image: https://storage.googleapis.com/syzbot-assets/677ac864031c/bzImage-d006330b.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+a6ffe86390c8a6afc818@syzkaller.appspotmail.com ================================================================== BUG: KASAN: slab-use-after-free in ucma_create_uevent+0xadb/0xb30 drivers/infiniband/core/ucma.c:275 Read of size 8 at addr ffff888029155410 by task kworker/u32:9/1147 CPU: 3 UID: 0 PID: 1147 Comm: kworker/u32:9 Not tainted 6.16.0-rc5-syzkaller-00025-gd006330be3f7 #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Workqueue: rdma_cm cma_iboe_join_work_handler Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:408 [inline] print_report+0xcd/0x680 mm/kasan/report.c:521 kasan_report+0xe0/0x110 mm/kasan/report.c:634 ucma_create_uevent+0xadb/0xb30 drivers/infiniband/core/ucma.c:275 ucma_event_handler+0x102/0x940 drivers/infiniband/core/ucma.c:351 cma_cm_event_handler+0x97/0x300 drivers/infiniband/core/cma.c:2173 cma_iboe_join_work_handler+0xca/0x170 drivers/infiniband/core/cma.c:3008 process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3238 process_scheduled_works kernel/workqueue.c:3321 [inline] worker_thread+0x6c8/0xf10 kernel/workqueue.c:3402 kthread+0x3c5/0x780 kernel/kthread.c:464 ret_from_fork+0x5d7/0x6f0 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Allocated by task 6107: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:394 kmalloc_noprof include/linux/slab.h:905 [inline] kzalloc_noprof include/linux/slab.h:1039 [inline] ucma_process_join+0x237/0xa30 drivers/infiniband/core/ucma.c:1465 ucma_join_multicast+0xe8/0x160 drivers/infiniband/core/ucma.c:1557 ucma_write+0x1fb/0x330 drivers/infiniband/core/ucma.c:1738 vfs_write+0x2a0/0x1150 fs/read_write.c:684 ksys_write+0x1f8/0x250 fs/read_write.c:738 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 6107: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:576 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x51/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2381 [inline] slab_free mm/slub.c:4643 [inline] kfree+0x2b4/0x4d0 mm/slub.c:4842 ucma_process_join+0x3b9/0xa30 drivers/infiniband/core/ucma.c:1516 ucma_join_multicast+0xe8/0x160 drivers/infiniband/core/ucma.c:1557 ucma_write+0x1fb/0x330 drivers/infiniband/core/ucma.c:1738 vfs_write+0x2a0/0x1150 fs/read_write.c:684 ksys_write+0x1f8/0x250 fs/read_write.c:738 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888029155400 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 16 bytes inside of freed 192-byte region [ffff888029155400, ffff8880291554c0) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x29155 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000000 ffff88801b8423c0 ffffea0000a60c80 dead000000000002 raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 1, tgid 1 (swapper/0), ts 12897812541, free_ts 0 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1704 prep_new_page mm/page_alloc.c:1712 [inline] get_page_from_freelist+0x1321/0x3890 mm/page_alloc.c:3669 __alloc_frozen_pages_noprof+0x261/0x23f0 mm/page_alloc.c:4959 alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2419 alloc_slab_page mm/slub.c:2451 [inline] allocate_slab mm/slub.c:2619 [inline] new_slab+0x23b/0x330 mm/slub.c:2673 ___slab_alloc+0xd9c/0x1940 mm/slub.c:3859 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3949 __slab_alloc_node mm/slub.c:4024 [inline] slab_alloc_node mm/slub.c:4185 [inline] __kmalloc_cache_noprof+0xfb/0x3e0 mm/slub.c:4354 kmalloc_noprof include/linux/slab.h:905 [inline] kzalloc_noprof include/linux/slab.h:1039 [inline] call_usermodehelper_setup+0xaf/0x360 kernel/umh.c:362 kobject_uevent_env+0x1690/0x1870 lib/kobject_uevent.c:628 driver_bound+0x164/0x230 drivers/base/dd.c:421 really_probe+0x62b/0xa90 drivers/base/dd.c:707 __driver_probe_device+0x1de/0x440 drivers/base/dd.c:799 driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:829 __device_attach_driver+0x1df/0x310 drivers/base/dd.c:957 bus_for_each_drv+0x156/0x1e0 drivers/base/bus.c:462 page_owner free stack trace missing Memory state around the buggy address: ffff888029155300: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888029155380: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff888029155400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888029155480: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888029155500: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== --- This report is generated by a bot. 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