program syz-executor0 not setting count and/or reply_len properly
==================================================================
BUG: KASAN: use-after-free in bio_copy_user_iov+0xe61/0xea0 block/bio.c:1205 at addr ffff8801c9b96000
Read of size 8 by task syz-executor0/3848
CPU: 0 PID: 3848 Comm: syz-executor0 Not tainted 4.9.44-g6dda7ac #31
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801ca4274c0 ffffffff81d929c9 ffff8801da0013c0 ffff8801c9b96000
 ffff8801c9b96100 ffffed0039372c00 ffff8801c9b96000 ffff8801ca4274e8
 ffffffff8153c5ec ffffed0039372c00 ffff8801da0013c0 0000000000000000
Call Trace:
 [<ffffffff81d929c9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d929c9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff8153c5ec>] kasan_object_err+0x1c/0x70 mm/kasan/report.c:160
 [<ffffffff8153c8ac>] print_address_description mm/kasan/report.c:198 [inline]
 [<ffffffff8153c8ac>] kasan_report_error mm/kasan/report.c:287 [inline]
 [<ffffffff8153c8ac>] kasan_report.part.1+0x21c/0x500 mm/kasan/report.c:309
 [<ffffffff8153cc49>] kasan_report mm/kasan/report.c:330 [inline]
 [<ffffffff8153cc49>] __asan_report_load8_noabort+0x29/0x30 mm/kasan/report.c:330
 [<ffffffff81cdff71>] bio_copy_user_iov+0xe61/0xea0 block/bio.c:1205
 [<ffffffff81d13ec7>] __blk_rq_map_user_iov block/blk-map.c:56 [inline]
 [<ffffffff81d13ec7>] blk_rq_map_user_iov+0x237/0x790 block/blk-map.c:133
 [<ffffffff81d14531>] blk_rq_map_user+0x111/0x1a0 block/blk-map.c:163
 [<ffffffff82668c0a>] sg_start_req drivers/scsi/sg.c:1766 [inline]
 [<ffffffff82668c0a>] sg_common_write.isra.24+0xc1a/0x17c0 drivers/scsi/sg.c:775
 [<ffffffff8266d028>] sg_write+0x688/0xad0 drivers/scsi/sg.c:678
 [<ffffffff8156a563>] __vfs_write+0x103/0x680 fs/read_write.c:510
 [<ffffffff8156e690>] vfs_write+0x170/0x4e0 fs/read_write.c:560
 [<ffffffff81572089>] SYSC_write fs/read_write.c:607 [inline]
 [<ffffffff81572089>] SyS_write+0xd9/0x1b0 fs/read_write.c:599
 [<ffffffff838a6805>] entry_SYSCALL_64_fastpath+0x23/0xc6
Object at ffff8801c9b96000, in cache kmalloc-256 size: 256
Allocated:
PID = 3848
 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 = 3849
 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:
 ffff8801c9b95f00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff8801c9b95f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8801c9b96000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                   ^
 ffff8801c9b96080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8801c9b96100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
==================================================================
BUG: KASAN: wild-memory-access on address ffe7087658f9c000
Write of size 38 by task syz-executor0/3848
CPU: 0 PID: 3848 Comm: syz-executor0 Tainted: G    B           4.9.44-g6dda7ac #31
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801ca427448 ffffffff81d929c9 ffff8801ca427618 0000000000000026
 0000000000000001 ffff8801ca427840 ffe7087658f9c000 ffff8801ca4274d0
 ffffffff8153ca9f 0000000000000000 0000000000000001 ffffffff81ddc284
Call Trace:
 [<ffffffff81d929c9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d929c9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff8153ca9f>] kasan_report_error mm/kasan/report.c:284 [inline]
 [<ffffffff8153ca9f>] kasan_report.part.1+0x40f/0x500 mm/kasan/report.c:309
 [<ffffffff8153ce70>] kasan_report+0x20/0x30 mm/kasan/report.c:296
 [<ffffffff8153b7b7>] check_memory_region_inline mm/kasan/kasan.c:308 [inline]
 [<ffffffff8153b7b7>] check_memory_region+0x137/0x190 mm/kasan/kasan.c:315
 [<ffffffff8153b844>] kasan_check_write+0x14/0x20 mm/kasan/kasan.c:326
 [<ffffffff81ddc284>] __copy_from_user arch/x86/include/asm/uaccess_64.h:114 [inline]
 [<ffffffff81ddc284>] copy_page_from_iter_iovec lib/iov_iter.c:267 [inline]
 [<ffffffff81ddc284>] copy_page_from_iter+0x1a4/0x5d0 lib/iov_iter.c:618
 [<ffffffff81cdfc15>] bio_copy_from_iter block/bio.c:1031 [inline]
 [<ffffffff81cdfc15>] bio_copy_user_iov+0xb05/0xea0 block/bio.c:1232
 [<ffffffff81d13ec7>] __blk_rq_map_user_iov block/blk-map.c:56 [inline]
 [<ffffffff81d13ec7>] blk_rq_map_user_iov+0x237/0x790 block/blk-map.c:133
 [<ffffffff81d14531>] blk_rq_map_user+0x111/0x1a0 block/blk-map.c:163
 [<ffffffff82668c0a>] sg_start_req drivers/scsi/sg.c:1766 [inline]
 [<ffffffff82668c0a>] sg_common_write.isra.24+0xc1a/0x17c0 drivers/scsi/sg.c:775
 [<ffffffff8266d028>] sg_write+0x688/0xad0 drivers/scsi/sg.c:678
 [<ffffffff8156a563>] __vfs_write+0x103/0x680 fs/read_write.c:510
 [<ffffffff8156e690>] vfs_write+0x170/0x4e0 fs/read_write.c:560
 [<ffffffff81572089>] SYSC_write fs/read_write.c:607 [inline]
 [<ffffffff81572089>] SyS_write+0xd9/0x1b0 fs/read_write.c:599
 [<ffffffff838a6805>] entry_SYSCALL_64_fastpath+0x23/0xc6
==================================================================
==================================================================
BUG: KASAN: wild-memory-access on address ffe7087658f9c000
Write of size 38 by task syz-executor0/3848
CPU: 0 PID: 3848 Comm: syz-executor0 Tainted: G    B           4.9.44-g6dda7ac #31
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801ca4273f8 ffffffff81d929c9 ffe7087658f9c000 0000000000000026
 0000000000000001 0000000020006fdb ffe7087658f9c000 ffff8801ca427480
 ffffffff8153ca9f 0000000000000000 0000000000000000 ffffffff81dc60d4
Call Trace:
 [<ffffffff81d929c9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d929c9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff8153ca9f>] kasan_report_error mm/kasan/report.c:284 [inline]
 [<ffffffff8153ca9f>] kasan_report.part.1+0x40f/0x500 mm/kasan/report.c:309