================================================================== BUG: KASAN: slab-out-of-bounds in ec168_i2c_xfer+0x4d5/0x630 drivers/media/usb/dvb-usb-v2/ec168.c:143 Read of size 1 at addr ffff888024ea8b41 by task syz.0.17/5933 CPU: 0 PID: 5933 Comm: syz.0.17 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0xa8/0x210 mm/kasan/report.c:468 kasan_report+0x117/0x150 mm/kasan/report.c:581 ec168_i2c_xfer+0x4d5/0x630 drivers/media/usb/dvb-usb-v2/ec168.c:143 __i2c_transfer+0x891/0x2090 drivers/i2c/i2c-core-base.c:-1 i2c_transfer+0x261/0x3a0 drivers/i2c/i2c-core-base.c:2355 i2cdev_ioctl_rdwr+0x3b0/0x690 drivers/i2c/i2c-dev.c:297 i2cdev_ioctl+0x6a0/0x840 drivers/i2c/i2c-dev.c:458 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:871 [inline] __se_sys_ioctl+0xfd/0x170 fs/ioctl.c:857 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f00b679e159 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffe9f0f49b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f00b6a25fa0 RCX: 00007f00b679e159 RDX: 0000200000000200 RSI: 0000000000000707 RDI: 0000000000000004 RBP: 00007f00b6835024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f00b6a25fac R14: 00007f00b6a25fa0 R15: 00007f00b6a25fa0 Allocated by task 5933: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4e/0x70 mm/kasan/common.c:53 ____kasan_kmalloc mm/kasan/common.c:375 [inline] __kasan_kmalloc+0x8f/0xa0 mm/kasan/common.c:384 kasan_kmalloc include/linux/kasan.h:198 [inline] __do_kmalloc_node mm/slab_common.c:1007 [inline] __kmalloc_node_track_caller+0xb4/0x230 mm/slab_common.c:1027 memdup_user+0x2b/0xc0 mm/util.c:197 i2cdev_ioctl_rdwr+0x116/0x690 drivers/i2c/i2c-dev.c:256 i2cdev_ioctl+0x6a0/0x840 drivers/i2c/i2c-dev.c:458 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:871 [inline] __se_sys_ioctl+0xfd/0x170 fs/ioctl.c:857 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 The buggy address belongs to the object at ffff888024ea8b40 which belongs to the cache kmalloc-8 of size 8 The buggy address is located 0 bytes to the right of allocated 1-byte region [ffff888024ea8b40, ffff888024ea8b41) The buggy address belongs to the physical page: page:ffffea000093aa00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x24ea8 flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000800 ffff888017c41280 dead000000000122 0000000000000000 raw: 0000000000000000 0000000080660066 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 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 5894, tgid 5894 (syz-executor), ts 107016510445, free_ts 107016367823 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1c1/0x200 mm/page_alloc.c:1582 prep_new_page mm/page_alloc.c:1589 [inline] get_page_from_freelist+0x2181/0x22a0 mm/page_alloc.c:3221 __alloc_pages+0x1f0/0x460 mm/page_alloc.c:4501 alloc_slab_page+0x5d/0x180 mm/slub.c:1881 allocate_slab mm/slub.c:2028 [inline] new_slab+0x87/0x2d0 mm/slub.c:2081 ___slab_alloc+0xc5c/0x12f0 mm/slub.c:3253 __slab_alloc mm/slub.c:3339 [inline] __slab_alloc_node mm/slub.c:3392 [inline] slab_alloc_node mm/slub.c:3485 [inline] __kmem_cache_alloc_node+0x11f/0x250 mm/slub.c:3534 __do_kmalloc_node mm/slab_common.c:1006 [inline] __kmalloc_node+0xa6/0x240 mm/slab_common.c:1014 kmalloc_node include/linux/slab.h:620 [inline] __vmalloc_area_node mm/vmalloc.c:3175 [inline] __vmalloc_node_range+0x598/0x1320 mm/vmalloc.c:3370 __vmalloc_node mm/vmalloc.c:3435 [inline] vzalloc+0x79/0x90 mm/vmalloc.c:3508 alloc_counters+0xcb/0x6c0 net/ipv4/netfilter/ip_tables.c:799 copy_entries_to_user net/ipv4/netfilter/ip_tables.c:821 [inline] get_entries net/ipv4/netfilter/ip_tables.c:1020 [inline] do_ipt_get_ctl+0xad5/0x1210 net/ipv4/netfilter/ip_tables.c:1665 nf_getsockopt+0x262/0x280 net/netfilter/nf_sockopt.c:116 ip_getsockopt+0x19f/0x230 net/ipv4/ip_sockglue.c:1790 do_sock_getsockopt+0x379/0x450 net/socket.c:2384 __sys_getsockopt net/socket.c:2413 [inline] __do_sys_getsockopt net/socket.c:2423 [inline] __se_sys_getsockopt net/socket.c:2420 [inline] __x64_sys_getsockopt+0x1d6/0x280 net/socket.c:2420 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1182 [inline] free_unref_page_prepare+0x7d7/0x8f0 mm/page_alloc.c:2366 free_unref_page+0x32/0x2e0 mm/page_alloc.c:2459 vfree+0x1a7/0x340 mm/vmalloc.c:2899 copy_entries_to_user net/ipv4/netfilter/ip_tables.c:864 [inline] get_entries net/ipv4/netfilter/ip_tables.c:1020 [inline] do_ipt_get_ctl+0xeef/0x1210 net/ipv4/netfilter/ip_tables.c:1665 nf_getsockopt+0x262/0x280 net/netfilter/nf_sockopt.c:116 ip_getsockopt+0x19f/0x230 net/ipv4/ip_sockglue.c:1790 do_sock_getsockopt+0x379/0x450 net/socket.c:2384 __sys_getsockopt net/socket.c:2413 [inline] __do_sys_getsockopt net/socket.c:2423 [inline] __se_sys_getsockopt net/socket.c:2420 [inline] __x64_sys_getsockopt+0x1d6/0x280 net/socket.c:2420 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Memory state around the buggy address: ffff888024ea8a00: 05 fc fc fc fc 06 fc fc fc fc fa fc fc fc fc 07 ffff888024ea8a80: fc fc fc fc 07 fc fc fc fc fa fc fc fc fc fa fc >ffff888024ea8b00: fc fc fc 00 fc fc fc fc 01 fc fc fc fc 00 fc fc ^ ffff888024ea8b80: fc fc 00 fc fc fc fc 00 fc fc fc fc 00 fc fc fc ffff888024ea8c00: fc 00 fc fc fc fc 00 fc fc fc fc 00 fc fc fc fc ==================================================================