BUG: memory leak
unreferenced object 0xffff88810e6a5800 (size 2048):
  comm "syz-executor.7", pid 6934, jiffies 4294949001 (age 30.930s)
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    20 00 00 00 00 01 00 00 00 00 00 00 00 00 00 00   ...............
  backtrace:
    [<000000009fee6bc0>] kmemleak_alloc_recursive include/linux/kmemleak.h:43 [inline]
    [<000000009fee6bc0>] slab_post_alloc_hook mm/slab.h:586 [inline]
    [<000000009fee6bc0>] slab_alloc mm/slab.c:3319 [inline]
    [<000000009fee6bc0>] __do_kmalloc mm/slab.c:3653 [inline]
    [<000000009fee6bc0>] __kmalloc+0x169/0x300 mm/slab.c:3664
    [<00000000ff5b4acf>] kmalloc include/linux/slab.h:561 [inline]
    [<00000000ff5b4acf>] bio_alloc_bioset+0x1b8/0x2c0 block/bio.c:440
    [<000000005f113a70>] bio_kmalloc include/linux/bio.h:405 [inline]
    [<000000005f113a70>] bio_copy_user_iov+0x121/0x4d0 block/bio.c:1248
    [<00000000bbd1d0ef>] __blk_rq_map_user_iov block/blk-map.c:73 [inline]
    [<00000000bbd1d0ef>] blk_rq_map_user_iov+0xc6/0x2b0 block/blk-map.c:142
    [<000000000e692d52>] blk_rq_map_user+0x71/0xb0 block/blk-map.c:172
    [<00000000960203e1>] sg_start_req drivers/scsi/sg.c:1813 [inline]
    [<00000000960203e1>] sg_common_write.isra.0+0x619/0xa10 drivers/scsi/sg.c:809
    [<00000000cc766a78>] sg_write.part.0+0x325/0x570 drivers/scsi/sg.c:709
    [<000000008b0245e7>] sg_write+0x44/0x64 drivers/scsi/sg.c:617
    [<0000000038c4821e>] __vfs_write+0x43/0xa0 fs/read_write.c:494
    [<00000000f4880ea6>] vfs_write fs/read_write.c:558 [inline]
    [<00000000f4880ea6>] vfs_write+0xee/0x210 fs/read_write.c:542
    [<00000000e8598a3b>] ksys_write+0x7c/0x130 fs/read_write.c:611
    [<00000000148ab3c8>] __do_sys_write fs/read_write.c:623 [inline]
    [<00000000148ab3c8>] __se_sys_write fs/read_write.c:620 [inline]
    [<00000000148ab3c8>] __x64_sys_write+0x1e/0x30 fs/read_write.c:620
    [<00000000341e93bd>] do_syscall_64+0x73/0x1f0 arch/x86/entry/common.c:290
    [<0000000022250104>] entry_SYSCALL_64_after_hwframe+0x44/0xa9