------------[ cut here ]------------ memcpy: detected field-spanning write (size 35) of single field "entry->buf" at include/trace/events/smbus.h:60 (size 34) WARNING: CPU: 1 PID: 6436 at include/trace/events/smbus.h:60 do_trace_event_raw_event_smbus_write include/trace/events/smbus.h:60 [inline] WARNING: CPU: 1 PID: 6436 at include/trace/events/smbus.h:60 trace_event_raw_event_smbus_write+0x338/0x44c include/trace/events/smbus.h:23 Modules linked in: CPU: 1 PID: 6436 Comm: syz.6.470 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/07/2026 pstate: 62400005 (nZCv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--) pc : do_trace_event_raw_event_smbus_write include/trace/events/smbus.h:60 [inline] pc : trace_event_raw_event_smbus_write+0x338/0x44c include/trace/events/smbus.h:23 lr : do_trace_event_raw_event_smbus_write include/trace/events/smbus.h:60 [inline] lr : trace_event_raw_event_smbus_write+0x338/0x44c include/trace/events/smbus.h:23 sp : ffff8000218077c0 x29: ffff800021807880 x28: dfff800000000000 x27: ffff700004300efc x26: ffff8000218077e0 x25: ffff0000d3491118 x24: 0000000000000000 x23: 0000000000000000 x22: ffff800021807b60 x21: 0000000000000023 x20: ffff000107139c3c x19: ffff800017d7f000 x18: 0000000000000000 x17: 20646c6569662065 x16: ffff800011ba0e90 x15: 0000000000000002 x14: 0000000000000001 x13: 1fffe00033e721a3 x12: 0000000000080000 x11: 000000000000530a x10: ffff800026f49000 x9 : 7f28cec7a4b12c00 x8 : 7f28cec7a4b12c00 x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff800021807258 x4 : ffff800015484e80 x3 : ffff800008540dd8 x2 : 0000000000000001 x1 : 0000000000000002 x0 : 0000000000000000 Call trace: do_trace_event_raw_event_smbus_write include/trace/events/smbus.h:60 [inline] trace_event_raw_event_smbus_write+0x338/0x44c include/trace/events/smbus.h:23 __traceiter_smbus_write include/trace/events/smbus.h:23 [inline] trace_smbus_write include/trace/events/smbus.h:23 [inline] __i2c_smbus_xfer+0x2110/0x23f0 drivers/i2c/i2c-core-smbus.c:571 i2c_smbus_xfer+0x1f0/0x314 drivers/i2c/i2c-core-smbus.c:545 i2cdev_ioctl_smbus+0x444/0x698 drivers/i2c/i2c-dev.c:381 i2cdev_ioctl+0x744/0x984 drivers/i2c/i2c-dev.c:467 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:856 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x200/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 irq event stamp: 742 hardirqs last enabled at (741): [] __up_console_sem+0xb4/0xfc kernel/printk/printk.c:261 hardirqs last disabled at (742): [] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:405 softirqs last enabled at (694): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (692): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19 ---[ end trace 0000000000000000 ]--- ================================================================== BUG: KASAN: stack-out-of-bounds in do_trace_event_raw_event_smbus_write include/trace/events/smbus.h:60 [inline] BUG: KASAN: stack-out-of-bounds in trace_event_raw_event_smbus_write+0x294/0x44c include/trace/events/smbus.h:23 Read of size 35 at addr ffff800021807b60 by task syz.6.470/6436 CPU: 1 PID: 6436 Comm: syz.6.470 Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/07/2026 Call trace: dump_backtrace+0x1c4/0x1f0 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf4/0x15c lib/dump_stack.c:106 print_address_description+0x88/0x218 mm/kasan/report.c:316 print_report+0x50/0x68 mm/kasan/report.c:420 kasan_report+0xa8/0xfc mm/kasan/report.c:524 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x258/0x290 mm/kasan/generic.c:189 memcpy+0x48/0x90 mm/kasan/shadow.c:65 do_trace_event_raw_event_smbus_write include/trace/events/smbus.h:60 [inline] trace_event_raw_event_smbus_write+0x294/0x44c include/trace/events/smbus.h:23 __traceiter_smbus_write include/trace/events/smbus.h:23 [inline] trace_smbus_write include/trace/events/smbus.h:23 [inline] __i2c_smbus_xfer+0x2110/0x23f0 drivers/i2c/i2c-core-smbus.c:571 i2c_smbus_xfer+0x1f0/0x314 drivers/i2c/i2c-core-smbus.c:545 i2cdev_ioctl_smbus+0x444/0x698 drivers/i2c/i2c-dev.c:381 i2cdev_ioctl+0x744/0x984 drivers/i2c/i2c-dev.c:467 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:856 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x200/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 The buggy address belongs to stack of task syz.6.470/6436 and is located at offset 32 in frame: i2cdev_ioctl_smbus+0x0/0x698 drivers/i2c/i2c-dev.c:309 This frame has 1 object: [32, 66) 'temp' The buggy address belongs to a 8-page vmalloc region starting at 0xffff800021800000 allocated at copy_process+0x4ec/0x38b4 kernel/fork.c:2192 The buggy address belongs to the physical page: page:00000000ca69a7c6 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x112fe7 memcg:ffff0000cc4cee02 flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000000000 0000000000000000 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000000000 00000001ffffffff ffff0000cc4cee02 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff800021807a80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff800021807b00: 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 00 00 00 >ffff800021807b80: 02 f3 f3 f3 f3 f3 f3 f3 00 00 00 00 00 00 00 00 ^ ffff800021807c00: 00 00 00 00 00 00 00 00 f1 f1 f1 f1 f8 f2 f8 f8 ffff800021807c80: f2 f2 00 00 f3 f3 f3 f3 00 00 00 00 00 00 00 00 ================================================================== i2c i2c-0: Invalid block write size 34