binder: 8290:8299 ioctl 40046207 0 returned -16 binder: BINDER_SET_CONTEXT_MGR already set binder: 8303:8317 ioctl 40046207 0 returned -16 ================================================================== BUG: KASAN: stack-out-of-bounds in iov_iter_advance+0x4b3/0x4f0 lib/iov_iter.c:491 Read of size 8 at addr ffff8801d08e7ce8 by task syz-executor.5/8319 CPU: 0 PID: 8319 Comm: syz-executor.5 Not tainted 4.4.174+ #17 0000000000000000 9cb8d497499f4ed3 ffff8801d08e7998 ffffffff81aad1a1 0000000000000000 ffffea00074239c0 ffff8801d08e7ce8 0000000000000008 ffff8801d08e7ce0 ffff8801d08e79d0 ffffffff81490120 0000000000000000 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x120 lib/dump_stack.c:51 [] print_address_description+0x6f/0x21b mm/kasan/report.c:252 [] kasan_report_error mm/kasan/report.c:351 [inline] [] kasan_report mm/kasan/report.c:408 [inline] [] kasan_report.cold+0x8c/0x2be mm/kasan/report.c:393 binder: BINDER_SET_CONTEXT_MGR already set binder: 8329:8329 ioctl 40046207 0 returned -16 binder: BINDER_SET_CONTEXT_MGR already set binder: 8332:8332 ioctl 40046207 0 returned -16 [] __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:429 [] iov_iter_advance+0x4b3/0x4f0 lib/iov_iter.c:491 [] tun_get_user+0x2c6/0x2640 drivers/net/tun.c:1124 [] tun_chr_write_iter+0xda/0x190 drivers/net/tun.c:1283 [] new_sync_write fs/read_write.c:480 [inline] [] __vfs_write+0x2e8/0x3d0 fs/read_write.c:493 [] vfs_write+0x182/0x4e0 fs/read_write.c:540 [] SYSC_write fs/read_write.c:587 [inline] [] SyS_write+0xdc/0x1c0 fs/read_write.c:579 [] do_syscall_32_irqs_on arch/x86/entry/common.c:330 [inline] [] do_fast_syscall_32+0x32d/0xa90 arch/x86/entry/common.c:397 binder: BINDER_SET_CONTEXT_MGR already set binder: 8327:8339 ioctl 40046207 0 returned -16 [] sysenter_flags_fixed+0xd/0x1a The buggy address belongs to the page: page:ffffea00074239c0 count:0 mapcount:0 mapping: (null) index:0x0 flags: 0x4000000000000000() page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801d08e7b80: 00 f2 f2 f2 f2 f2 00 00 00 00 00 00 00 f3 f3 f3 ffff8801d08e7c00: f3 f3 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8801d08e7c80: 00 00 00 00 00 00 f1 f1 f1 f1 00 00 f2 f2 00 00 ^ ffff8801d08e7d00: 00 00 00 f2 f2 f2 f2 f2 00 00 00 00 00 f3 f3 f3 ffff8801d08e7d80: f3 f3 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== binder: BINDER_SET_CONTEXT_MGR already set binder: BINDER_SET_CONTEXT_MGR already set binder: 8350:8350 ioctl 40046207 0 returned -16 binder: 8316:8345 ioctl 40046207 0 returned -16 binder: BINDER_SET_CONTEXT_MGR already set binder: 8316:8355 ioctl 40046207 0 returned -16 binder: BINDER_SET_CONTEXT_MGR already set binder: BINDER_SET_CONTEXT_MGR already set binder: 8364:8364 ioctl 40046207 0 returned -16 binder: 8347:8361 ioctl 40046207 0 returned -16 binder: BINDER_SET_CONTEXT_MGR already set binder: 8373:8373 ioctl 40046207 0 returned -16 binder: BINDER_SET_CONTEXT_MGR already set binder: BINDER_SET_CONTEXT_MGR already set binder: 8383:8383 ioctl 40046207 0 returned -16 binder: 8385:8385 ioctl 40046207 0 returned -16 binder: BINDER_SET_CONTEXT_MGR already set binder: 8399:8399 ioctl 40046207 0 returned -16