================================================================== BUG: KASAN: use-after-free in bio_copy_user_iov+0xe61/0xea0 block/bio.c:1205 at addr ffff8801cfc55000 Read of size 8 by task syz-executor3/5495 CPU: 1 PID: 5495 Comm: syz-executor3 Not tainted 4.9.42-g02f29ab #24 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ffff8801d6bef4c0 ffffffff81d92909 ffff8801da0013c0 ffff8801cfc55000 ffff8801cfc55100 ffffed0039f8aa00 ffff8801cfc55000 ffff8801d6bef4e8 ffffffff8153c51c ffffed0039f8aa00 ffff8801da0013c0 0000000000000000 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x128 lib/dump_stack.c:51 [] kasan_object_err+0x1c/0x70 mm/kasan/report.c:160 [] print_address_description mm/kasan/report.c:198 [inline] [] kasan_report_error mm/kasan/report.c:287 [inline] [] kasan_report.part.1+0x21c/0x500 mm/kasan/report.c:309 [] kasan_report mm/kasan/report.c:330 [inline] [] __asan_report_load8_noabort+0x29/0x30 mm/kasan/report.c:330 [] bio_copy_user_iov+0xe61/0xea0 block/bio.c:1205 [] __blk_rq_map_user_iov block/blk-map.c:56 [inline] [] blk_rq_map_user_iov+0x237/0x790 block/blk-map.c:133 [] blk_rq_map_user+0x111/0x1a0 block/blk-map.c:163 [] sg_start_req drivers/scsi/sg.c:1766 [inline] [] sg_common_write.isra.24+0xc1a/0x17c0 drivers/scsi/sg.c:775 [] sg_write+0x688/0xad0 drivers/scsi/sg.c:678 [] __vfs_write+0x103/0x680 fs/read_write.c:510 [] vfs_write+0x170/0x4e0 fs/read_write.c:560 [] SYSC_write fs/read_write.c:607 [inline] [] SyS_write+0xd9/0x1b0 fs/read_write.c:599 [] entry_SYSCALL_64_fastpath+0x23/0xc6 Object at ffff8801cfc55000, in cache kmalloc-256 size: 256 Allocated: PID = 5500 save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:57 save_stack+0x43/0xd0 mm/kasan/kasan.c:495 set_track mm/kasan/kasan.c:507 [inline] kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:598 __kmalloc+0x11d/0x310 mm/slub.c:3741 kmalloc include/linux/slab.h:495 [inline] kzalloc include/linux/slab.h:636 [inline] sg_build_sgat drivers/scsi/sg.c:1816 [inline] sg_build_indirect.isra.23+0x8b/0x550 drivers/scsi/sg.c:1842 sg_build_reserve+0x8d/0xb0 drivers/scsi/sg.c:1973 sg_add_sfp drivers/scsi/sg.c:2160 [inline] sg_open+0x946/0x15a0 drivers/scsi/sg.c:329 chrdev_open+0x22b/0x4c0 fs/char_dev.c:392 do_dentry_open+0x607/0xc60 fs/open.c:766 vfs_open+0x105/0x220 fs/open.c:879 do_last fs/namei.c:3402 [inline] path_openat+0x64c/0x2a60 fs/namei.c:3525 do_filp_open+0x197/0x290 fs/namei.c:3560 do_sys_open+0x352/0x4c0 fs/open.c:1072 SYSC_open fs/open.c:1090 [inline] SyS_open+0x2d/0x40 fs/open.c:1085 entry_SYSCALL_64_fastpath+0x23/0xc6 Freed: PID = 5500 save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:57 save_stack+0x43/0xd0 mm/kasan/kasan.c:495 set_track mm/kasan/kasan.c:507 [inline] kasan_slab_free+0x73/0xc0 mm/kasan/kasan.c:571 slab_free_hook mm/slub.c:1355 [inline] slab_free_freelist_hook mm/slub.c:1377 [inline] slab_free mm/slub.c:2958 [inline] kfree+0xf0/0x2f0 mm/slub.c:3878 sg_remove_scat.isra.20+0x212/0x2d0 drivers/scsi/sg.c:1924 sg_ioctl+0x12d0/0x29f0 drivers/scsi/sg.c:973 vfs_ioctl fs/ioctl.c:43 [inline] do_vfs_ioctl+0x1aa/0x10c0 fs/ioctl.c:679 SYSC_ioctl fs/ioctl.c:694 [inline] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:685 entry_SYSCALL_64_fastpath+0x23/0xc6 Memory state around the buggy address: ffff8801cfc54f00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8801cfc54f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8801cfc55000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8801cfc55080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801cfc55100: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00 ================================================================== ================================================================== BUG: KASAN: wild-memory-access on address ffe708727bd00000 Write of size 2 by task syz-executor3/5495 CPU: 1 PID: 5495 Comm: syz-executor3 Tainted: G B 4.9.42-g02f29ab #24 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ffff8801d6bef448 ffffffff81d92909 ffff8801d6bef618 0000000000000002 0000000000000001 ffff8801d6bef840 ffe708727bd00000 ffff8801d6bef4d0 ffffffff8153c9cf 0000000000000000 0000000000000001 ffffffff81ddc1c4 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x128 lib/dump_stack.c:51 [] kasan_report_error mm/kasan/report.c:284 [inline] [] kasan_report.part.1+0x40f/0x500 mm/kasan/report.c:309 [] kasan_report+0x20/0x30 mm/kasan/report.c:296 [] check_memory_region_inline mm/kasan/kasan.c:308 [inline] [] check_memory_region+0x137/0x190 mm/kasan/kasan.c:315 [] kasan_check_write+0x14/0x20 mm/kasan/kasan.c:326 [] __copy_from_user arch/x86/include/asm/uaccess_64.h:114 [inline] [] copy_page_from_iter_iovec lib/iov_iter.c:267 [inline] [] copy_page_from_iter+0x1a4/0x5d0 lib/iov_iter.c:618 [] bio_copy_from_iter block/bio.c:1031 [inline] [] bio_copy_user_iov+0xb05/0xea0 block/bio.c:1232 [] __blk_rq_map_user_iov block/blk-map.c:56 [inline] [] blk_rq_map_user_iov+0x237/0x790 block/blk-map.c:133 [] blk_rq_map_user+0x111/0x1a0 block/blk-map.c:163 [] sg_start_req drivers/scsi/sg.c:1766 [inline] [] sg_common_write.isra.24+0xc1a/0x17c0 drivers/scsi/sg.c:775 [] sg_write+0x688/0xad0 drivers/scsi/sg.c:678 [] __vfs_write+0x103/0x680 fs/read_write.c:510 [] vfs_write+0x170/0x4e0 fs/read_write.c:560 [] SYSC_write fs/read_write.c:607 [inline] [] SyS_write+0xd9/0x1b0 fs/read_write.c:599 [] entry_SYSCALL_64_fastpath+0x23/0xc6 ================================================================== ================================================================== BUG: KASAN: wild-memory-access on address ffe708727bd00000 Write of size 2 by task syz-executor3/5495 CPU: 1 PID: 5495 Comm: syz-executor3 Tainted: G B 4.9.42-g02f29ab #24 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ffff8801d6bef3f8 ffffffff81d92909 ffe708727bd00000 0000000000000002 0000000000000001 00000000205cbf9f ffe708727bd00000 ffff8801d6bef480 ffffffff8153c9cf 0000000000000000 0000000000000000 ffffffff81dc6014 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x128 lib/dump_stack.c:51 [] kasan_report_error mm/kasan/report.c:284 [inline] [] kasan_report.part.1+0x40f/0x500 mm/kasan/report.c:309