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BUG: KASAN: slab-out-of-bounds in _copy_to_iter+0x493/0x1420
Read of size 4090 at addr ffff8880461b4006 by task syz-executor.2/4480

CPU: 0 PID: 4480 Comm: syz-executor.2 Not tainted 5.19.0-rc6-next-20220715 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0x8b/0xb3
 print_report.cold+0x5e/0x5e5
 kasan_report+0xb1/0x1c0
 kasan_check_range+0x35/0x1c0
 memcpy+0x20/0x60
 _copy_to_iter+0x493/0x1420
 seq_read_iter+0xdcb/0x12b0
 proc_reg_read_iter+0x117/0x2e0
 generic_file_splice_read+0x187/0x4d0
 do_splice_to+0x1bc/0x240
 splice_direct_to_actor+0x2ac/0x8c0
 do_splice_direct+0x1b8/0x290
 do_sendfile+0xb1d/0x1280
 __x64_sys_sendfile64+0x1d1/0x210
 do_syscall_64+0x3b/0x90
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fbc734e5b19
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fbc70a5b188 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007fbc735f8f60 RCX: 00007fbc734e5b19
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000003
RBP: 00007fbc7353ff6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000006 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe72dda55f R14: 00007fbc70a5b300 R15: 0000000000022000
 </TASK>

Allocated by task 4480:
 kasan_save_stack+0x1e/0x40
 __kasan_kmalloc+0x81/0xa0
 kvmalloc_node+0x41/0x1e0
 single_open_size+0x4a/0x130
 proc_reg_open+0xe1/0x510
 do_dentry_open+0x4ae/0x1260
 path_openat+0x19e1/0x2800
 do_filp_open+0x1b6/0x410
 do_sys_openat2+0x171/0x4c0
 __x64_sys_openat+0x13f/0x1f0
 do_syscall_64+0x3b/0x90
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

The buggy address belongs to the object at ffff8880461b4000
 which belongs to the cache kmalloc-cg-4k of size 4096
The buggy address is located 6 bytes inside of
 4096-byte region [ffff8880461b4000, ffff8880461b5000)

The buggy address belongs to the physical page:
page:0000000005257b49 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x461b0
head:0000000005257b49 order:3 compound_mapcount:0 compound_pincount:0
memcg:ffff88801a5a33c1
flags: 0x100000000010200(slab|head|node=0|zone=1)
raw: 0100000000010200 ffffea000078f400 dead000000000002 ffff88800784c280
raw: 0000000000000000 0000000080040004 00000001ffffffff ffff88801a5a33c1
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880461b4700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8880461b4780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8880461b4800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc
                                                             ^
 ffff8880461b4880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8880461b4900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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FAT-fs (loop6): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)