================================================================== BUG: KASAN: slab-out-of-bounds in qrtr_endpoint_post+0x1204/0x1240 net/qrtr/qrtr.c:511 Read of size 4 at addr ffff88802205d16c by task syz-executor.0/13664 CPU: 1 PID: 13664 Comm: syz-executor.0 Not tainted 5.14.0-rc3-next-20210727-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:105 print_address_description.constprop.0.cold+0x6c/0x309 mm/kasan/report.c:256 __kasan_report mm/kasan/report.c:442 [inline] kasan_report.cold+0x83/0xdf mm/kasan/report.c:459 qrtr_endpoint_post+0x1204/0x1240 net/qrtr/qrtr.c:511 qrtr_tun_write_iter+0x125/0x1a0 net/qrtr/tun.c:108 call_write_iter include/linux/fs.h:2152 [inline] new_sync_write+0x426/0x650 fs/read_write.c:518 vfs_write+0x75a/0xa40 fs/read_write.c:605 ksys_write+0x12d/0x250 fs/read_write.c:658 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665e9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fdc19e71188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665e9 RDX: 0000000000000020 RSI: 0000000020000040 RDI: 0000000000000003 RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007ffcc21dc13f R14: 00007fdc19e71300 R15: 0000000000022000 Allocated by task 13664: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc mm/kasan/common.c:513 [inline] ____kasan_kmalloc mm/kasan/common.c:472 [inline] __kasan_kmalloc+0x9b/0xd0 mm/kasan/common.c:522 kmalloc include/linux/slab.h:596 [inline] kzalloc include/linux/slab.h:721 [inline] qrtr_tun_write_iter+0xbf/0x1a0 net/qrtr/tun.c:99 call_write_iter include/linux/fs.h:2152 [inline] new_sync_write+0x426/0x650 fs/read_write.c:518 vfs_write+0x75a/0xa40 fs/read_write.c:605 ksys_write+0x12d/0x250 fs/read_write.c:658 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae The buggy address belongs to the object at ffff88802205d140 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 12 bytes to the right of 32-byte region [ffff88802205d140, ffff88802205d160) The buggy address belongs to the page: page:ffffea0000881740 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2205d flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea0000652140 0000000500000005 ffff888010c41500 raw: 0000000000000000 0000000080400040 00000001ffffffff 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 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 1, ts 10029978175, free_ts 9890487492 prep_new_page mm/page_alloc.c:2424 [inline] get_page_from_freelist+0xa72/0x2f80 mm/page_alloc.c:4152 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5374 alloc_page_interleave+0x1e/0x200 mm/mempolicy.c:2124 alloc_pages+0x26a/0x2d0 mm/mempolicy.c:2274 alloc_slab_page mm/slub.c:1690 [inline] allocate_slab+0x32e/0x4b0 mm/slub.c:1830 new_slab mm/slub.c:1893 [inline] new_slab_objects mm/slub.c:2639 [inline] ___slab_alloc+0x4ba/0x820 mm/slub.c:2802 __slab_alloc.constprop.0+0xa7/0xf0 mm/slub.c:2842 slab_alloc_node mm/slub.c:2924 [inline] slab_alloc mm/slub.c:2966 [inline] __kmalloc+0x312/0x330 mm/slub.c:4102 kmalloc include/linux/slab.h:596 [inline] kzalloc include/linux/slab.h:721 [inline] rh_call_control drivers/usb/core/hcd.c:514 [inline] rh_urb_enqueue drivers/usb/core/hcd.c:841 [inline] usb_hcd_submit_urb+0x663/0x22d0 drivers/usb/core/hcd.c:1544 usb_submit_urb+0x86d/0x18a0 drivers/usb/core/urb.c:594 usb_start_wait_urb+0x101/0x4c0 drivers/usb/core/message.c:58 usb_internal_control_msg drivers/usb/core/message.c:102 [inline] usb_control_msg+0x31c/0x4a0 drivers/usb/core/message.c:153 usb_get_descriptor+0xdd/0x1d0 drivers/usb/core/message.c:793 usb_get_device_descriptor+0x81/0xf0 drivers/usb/core/message.c:1071 register_root_hub drivers/usb/core/hcd.c:990 [inline] usb_add_hcd.cold+0x1196/0x1813 drivers/usb/core/hcd.c:2939 dummy_hcd_probe+0x19f/0x310 drivers/usb/gadget/udc/dummy_hcd.c:2675 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1338 [inline] free_pcp_prepare+0x373/0x860 mm/page_alloc.c:1389 free_unref_page_prepare mm/page_alloc.c:3315 [inline] free_unref_page+0x19/0x690 mm/page_alloc.c:3394 mm_free_pgd kernel/fork.c:636 [inline] __mmdrop+0xcb/0x3f0 kernel/fork.c:738 mmdrop include/linux/sched/mm.h:49 [inline] __mmput+0x3b4/0x470 kernel/fork.c:1162 mmput+0x58/0x60 kernel/fork.c:1173 free_bprm+0x65/0x2e0 fs/exec.c:1479 kernel_execve+0x380/0x460 fs/exec.c:1976 call_usermodehelper_exec_async+0x2e3/0x580 kernel/umh.c:112 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Memory state around the buggy address: ffff88802205d000: fb fb fb fb fc fc fc fc 00 00 00 01 fc fc fc fc ffff88802205d080: 00 00 00 00 fc fc fc fc 00 00 06 fc fc fc fc fc >ffff88802205d100: 00 00 00 fc fc fc fc fc 00 00 00 00 fc fc fc fc ^ ffff88802205d180: fa fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ffff88802205d200: fb fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc ==================================================================