==================================================================
BUG: KASAN: stack-out-of-bounds in ipmr_ioctl+0x886/0xaf0
Read of size 4 at addr ffff888035217b24 by task syz-executor.5/23220

CPU: 0 PID: 23220 Comm: syz-executor.5 Not tainted 6.4.0-rc7-next-20230621 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0x91/0xf0
 print_report+0xcc/0x620
 kasan_report+0xbe/0xf0
 ipmr_ioctl+0x886/0xaf0
 raw_ioctl+0x4e/0x1e0
 sk_ioctl+0x14b/0x320
 inet_ioctl+0x18c/0x390
 sock_do_ioctl+0xd2/0x240
 sock_ioctl+0x424/0x670
 __x64_sys_ioctl+0x1a4/0x210
 do_syscall_64+0x3f/0x90
 entry_SYSCALL_64_after_hwframe+0x6e/0xd8
RIP: 0033:0x7f5976a76b19
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:00007f5973fec188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f5976b89f60 RCX: 00007f5976a76b19
RDX: 0000000000000000 RSI: 00000000000089e1 RDI: 0000000000000003
RBP: 00007f5976ad0f6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffd5e84b9bf R14: 00007f5973fec300 R15: 0000000000022000
 </TASK>

The buggy address belongs to stack of task syz-executor.5/23220
 and is located at offset 36 in frame:
 sk_ioctl+0x0/0x320

This frame has 1 object:
 [32, 36) 'karg'

The buggy address belongs to the physical page:
page:0000000039f99e52 refcount:0 mapcount:0 mapping:0000000000000000 index:0x2 pfn:0x35217
flags: 0x100000000000000(node=0|zone=1)
page_type: 0xffffffff()
raw: 0100000000000000 0000000000000000 ffffffff00000101 0000000000000000
raw: 0000000000000002 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888035217a00: 00 00 00 00 00 00 00 f1 f1 f1 f1 00 f3 f3 f3 00
 ffff888035217a80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888035217b00: f1 f1 f1 f1 04 f3 f3 f3 00 00 00 00 00 00 00 00
                               ^
 ffff888035217b80: 00 00 00 f1 f1 f1 f1 f1 f1 00 00 00 00 00 f2 f2
 ffff888035217c00: f2 f2 f2 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
loop5: detected capacity change from 0 to 40
syz-executor.5: attempt to access beyond end of device
loop5: rw=2049, sector=40, nr_sectors = 4 limit=40
buffer_io_error: 78 callbacks suppressed
Buffer I/O error on dev loop5, logical block 10, lost async page write
loop5: detected capacity change from 0 to 40
loop6: detected capacity change from 0 to 40
loop0: detected capacity change from 0 to 40
syz-executor.6: attempt to access beyond end of device
loop6: rw=2049, sector=40, nr_sectors = 4 limit=40
Buffer I/O error on dev loop6, logical block 10, lost async page write
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
syz-executor.0: attempt to access beyond end of device
loop0: rw=2049, sector=40, nr_sectors = 4 limit=40
Buffer I/O error on dev loop0, logical block 10, lost async page write
loop6: detected capacity change from 0 to 40
loop5: detected capacity change from 0 to 40
loop0: detected capacity change from 0 to 40
loop7: detected capacity change from 0 to 40
syz-executor.6: attempt to access beyond end of device
loop6: rw=2049, sector=40, nr_sectors = 4 limit=40
Buffer I/O error on dev loop6, logical block 10, lost async page write
loop3: detected capacity change from 0 to 40
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
syz-executor.3: attempt to access beyond end of device
loop3: rw=2049, sector=40, nr_sectors = 4 limit=40
Buffer I/O error on dev loop3, logical block 10, lost async page write
syz-executor.7: attempt to access beyond end of device
loop7: rw=2049, sector=40, nr_sectors = 4 limit=40
Buffer I/O error on dev loop7, logical block 10, lost async page write
loop5: detected capacity change from 0 to 40
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
loop7: detected capacity change from 0 to 40
syz-executor.7: attempt to access beyond end of device
loop7: rw=2049, sector=40, nr_sectors = 4 limit=40
Buffer I/O error on dev loop7, logical block 10, lost async page write
loop6: detected capacity change from 0 to 40
loop3: detected capacity change from 0 to 40
loop7: detected capacity change from 0 to 40
loop0: detected capacity change from 0 to 40
loop3: detected capacity change from 0 to 40