================================================================== BUG: KASAN: slab-out-of-bounds in instrument_copy_to_user include/linux/instrumented.h:119 [inline] BUG: KASAN: slab-out-of-bounds in _copy_to_user lib/usercopy.c:33 [inline] BUG: KASAN: slab-out-of-bounds in _copy_to_user+0x116/0x140 lib/usercopy.c:27 Read of size 16 at addr ffff8880699a9bd8 by task syz-executor.5/27997 CPU: 0 PID: 27997 Comm: syz-executor.5 Not tainted 6.1.0-rc2-syzkaller-00105-gb229b6ca5abb #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:284 [inline] print_report+0x15e/0x45d mm/kasan/report.c:395 kasan_report+0xbb/0x1f0 mm/kasan/report.c:495 check_region_inline mm/kasan/generic.c:183 [inline] kasan_check_range+0x13d/0x180 mm/kasan/generic.c:189 instrument_copy_to_user include/linux/instrumented.h:119 [inline] _copy_to_user lib/usercopy.c:33 [inline] _copy_to_user+0x116/0x140 lib/usercopy.c:27 copy_to_user include/linux/uaccess.h:169 [inline] v4l2_compat_put_array_args+0x480/0x830 drivers/media/v4l2-core/v4l2-compat-ioctl32.c:1154 video_usercopy+0x4e7/0x17e0 drivers/media/v4l2-core/v4l2-ioctl.c:3409 v4l2_ioctl+0x1b3/0x250 drivers/media/v4l2-core/v4l2-dev.c:364 v4l2_compat_ioctl32+0x237/0x2a0 drivers/media/v4l2-core/v4l2-compat-ioctl32.c:1253 __do_compat_sys_ioctl+0x1c7/0x290 fs/ioctl.c:968 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x70/0x82 RIP: 0023:0xf7fab549 Code: 03 74 c0 01 10 05 03 74 b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f7fa65cc EFLAGS: 00000296 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000c0cc5604 RDX: 0000000020000440 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000296 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 27997: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:45 kasan_set_track+0x21/0x30 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:371 [inline] ____kasan_kmalloc mm/kasan/common.c:330 [inline] __kasan_kmalloc+0xa1/0xb0 mm/kasan/common.c:380 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:955 [inline] __kmalloc_node+0x57/0xc0 mm/slab_common.c:962 kmalloc_node include/linux/slab.h:602 [inline] kvmalloc_node+0x3f/0x1b0 mm/util.c:581 kvmalloc include/linux/slab.h:729 [inline] video_usercopy+0x264/0x17e0 drivers/media/v4l2-core/v4l2-ioctl.c:3367 v4l2_ioctl+0x1b3/0x250 drivers/media/v4l2-core/v4l2-dev.c:364 v4l2_compat_ioctl32+0x237/0x2a0 drivers/media/v4l2-core/v4l2-compat-ioctl32.c:1253 __do_compat_sys_ioctl+0x1c7/0x290 fs/ioctl.c:968 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x70/0x82 The buggy address belongs to the object at ffff8880699a9bc0 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 24 bytes inside of 32-byte region [ffff8880699a9bc0, ffff8880699a9be0) The buggy address belongs to the physical page: page:ffffea0001a66a40 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x699a9 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 0000000000000000 dead000000000001 ffff888011841500 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 0x112a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL), pid 11073, tgid 11059 (syz-executor.4), ts 396517535606, free_ts 393411767058 prep_new_page mm/page_alloc.c:2538 [inline] get_page_from_freelist+0x10b5/0x2d50 mm/page_alloc.c:4287 __alloc_pages+0x1c7/0x5a0 mm/page_alloc.c:5554 alloc_pages+0x1a6/0x270 mm/mempolicy.c:2285 alloc_slab_page mm/slub.c:1794 [inline] allocate_slab+0x213/0x300 mm/slub.c:1939 new_slab mm/slub.c:1992 [inline] ___slab_alloc+0xa91/0x1400 mm/slub.c:3180 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3279 slab_alloc_node mm/slub.c:3364 [inline] __kmem_cache_alloc_node+0x191/0x3e0 mm/slub.c:3437 kmalloc_trace+0x22/0x60 mm/slab_common.c:1046 kmalloc include/linux/slab.h:576 [inline] kzalloc include/linux/slab.h:712 [inline] ref_tracker_alloc+0x14c/0x550 lib/ref_tracker.c:85 __netdev_tracker_alloc include/linux/netdevice.h:3995 [inline] netdev_hold include/linux/netdevice.h:4024 [inline] dst_init+0xe0/0x520 net/core/dst.c:52 dst_alloc+0x16b/0x1f0 net/core/dst.c:96 rt_dst_alloc+0x51/0x430 net/ipv4/route.c:1633 __mkroute_output net/ipv4/route.c:2592 [inline] ip_route_output_key_hash_rcu+0x895/0x2bc0 net/ipv4/route.c:2814 ip_route_output_key_hash+0x18b/0x300 net/ipv4/route.c:2643 __ip_route_output_key include/net/route.h:140 [inline] ip_route_output_flow+0x23/0x150 net/ipv4/route.c:2873 udp_sendmsg+0x1963/0x2740 net/ipv4/udp.c:1224 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1458 [inline] free_pcp_prepare+0x65c/0xd90 mm/page_alloc.c:1508 free_unref_page_prepare mm/page_alloc.c:3386 [inline] free_unref_page+0x19/0x4d0 mm/page_alloc.c:3482 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x62/0x80 mm/kasan/common.c:302 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slab.h:737 [inline] slab_alloc_node mm/slub.c:3398 [inline] __kmem_cache_alloc_node+0x2da/0x3e0 mm/slub.c:3437 __do_kmalloc_node mm/slab_common.c:954 [inline] __kmalloc_node_track_caller+0x45/0xc0 mm/slab_common.c:975 kmalloc_reserve net/core/skbuff.c:437 [inline] __alloc_skb+0xd9/0x2f0 net/core/skbuff.c:509 alloc_skb include/linux/skbuff.h:1267 [inline] _sctp_make_chunk+0x50/0x270 net/sctp/sm_make_chunk.c:1443 sctp_make_data net/sctp/sm_make_chunk.c:1475 [inline] sctp_make_datafrag_empty+0x164/0x230 net/sctp/sm_make_chunk.c:740 sctp_datamsg_from_user+0x625/0x11f0 net/sctp/chunk.c:262 sctp_sendmsg_to_asoc+0xc54/0x1a30 net/sctp/socket.c:1853 sctp_sendmsg+0x1053/0x1d50 net/sctp/socket.c:2025 inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:825 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:734 sock_no_sendpage+0x108/0x150 net/core/sock.c:3219 Memory state around the buggy address: ffff8880699a9a80: 00 00 00 00 fc fc fc fc 00 00 00 00 fc fc fc fc ffff8880699a9b00: 00 00 00 00 fc fc fc fc 00 00 00 00 fc fc fc fc >ffff8880699a9b80: 00 00 00 00 fc fc fc fc 00 00 00 fc fc fc fc fc ^ ffff8880699a9c00: 00 00 00 00 fc fc fc fc 00 00 03 fc fc fc fc fc ffff8880699a9c80: 00 00 00 00 fc fc fc fc 00 00 00 00 fc fc fc fc ================================================================== ---------------- Code disassembly (best guess): 0: 03 74 c0 01 add 0x1(%rax,%rax,8),%esi 4: 10 05 03 74 b8 01 adc %al,0x1b87403(%rip) # 0x1b8740d a: 10 06 adc %al,(%rsi) c: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi 10: 10 07 adc %al,(%rdi) 12: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi 16: 10 08 adc %cl,(%rax) 18: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi 1c: 00 00 add %al,(%rax) 1e: 00 00 add %al,(%rax) 20: 00 51 52 add %dl,0x52(%rcx) 23: 55 push %rbp 24: 89 e5 mov %esp,%ebp 26: 0f 34 sysenter 28: cd 80 int $0x80 * 2a: 5d pop %rbp <-- trapping instruction 2b: 5a pop %rdx 2c: 59 pop %rcx 2d: c3 retq 2e: 90 nop 2f: 90 nop 30: 90 nop 31: 90 nop 32: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 39: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi