==================================================================
BUG: KASAN: slab-out-of-bounds in _copy_to_iter+0x493/0x1420
Read of size 4096 at addr ffff88804628d000 by task syz-executor.6/4879

CPU: 1 PID: 4879 Comm: syz-executor.6 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
 generic_file_splice_read+0x187/0x4d0
 do_splice_to+0x1bc/0x240
 splice_file_to_pipe+0x104/0x120
 do_sendfile+0x42a/0x1280
 __x64_sys_sendfile64+0x1d1/0x210
 do_syscall_64+0x3b/0x90
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fee955fcb19
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:00007fee92b72188 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007fee9570ff60 RCX: 00007fee955fcb19
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000006
RBP: 00007fee95656f6d R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000db8a R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffcf6ffa9ef R14: 00007fee92b72300 R15: 0000000000022000
 </TASK>

Allocated by task 4879:
 kasan_save_stack+0x1e/0x40
 __kasan_kmalloc+0x81/0xa0
 kvmalloc_node+0x41/0x1e0
 seq_read_iter+0x81c/0x12b0
 generic_file_splice_read+0x187/0x4d0
 do_splice_to+0x1bc/0x240
 splice_file_to_pipe+0x104/0x120
 do_sendfile+0x42a/0x1280
 __x64_sys_sendfile64+0x1d1/0x210
 do_syscall_64+0x3b/0x90
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

The buggy address belongs to the object at ffff88804628c000
 which belongs to the cache kmalloc-cg-4k of size 4096
The buggy address is located 0 bytes to the right of
 4096-byte region [ffff88804628c000, ffff88804628d000)

The buggy address belongs to the physical page:
page:0000000050e57e93 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x46288
head:0000000050e57e93 order:3 compound_mapcount:0 compound_pincount:0
memcg:ffff88801b8ce0c1
flags: 0x100000000010200(slab|head|node=0|zone=1)
raw: 0100000000010200 0000000000000000 dead000000000122 ffff88800784c280
raw: 0000000000000000 0000000080040004 00000001ffffffff ffff88801b8ce0c1
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88804628cf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88804628cf80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88804628d000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                   ^
 ffff88804628d080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88804628d100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
loop5: detected capacity change from 0 to 40
loop4: detected capacity change from 0 to 264192
loop7: detected capacity change from 0 to 512
syz-executor.5: attempt to access beyond end of device
loop5: rw=2049, sector=40, nr_sectors = 4 limit=40
buffer_io_error: 54 callbacks suppressed
Buffer I/O error on dev loop5, logical block 10, lost async page write
EXT4-fs (loop7): mounted filesystem without journal. Quota mode: none.
loop5: detected capacity change from 0 to 40
random: crng reseeded on system resumption
EXT4-fs (loop7): unmounting filesystem.
syz-executor.5: attempt to access beyond end of device
loop5: rw=2049, sector=40, nr_sectors = 4 limit=40
Buffer I/O error on dev loop5, logical block 10, lost async page write
Restarting kernel threads ... done.