syzbot

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BUG: KMSAN: uninit-value in cmsghdr_from_user_compat_to_kern+0x568/0x10d0 net/compat.c:154
 cmsghdr_from_user_compat_to_kern+0x568/0x10d0 net/compat.c:154
 ____sys_sendmsg+0x222/0xb60 net/socket.c:2543
 __sys_sendmsg_sock+0x42/0x60 net/socket.c:2647
 io_sendmsg+0x36a/0xe30 io_uring/net.c:556
 io_issue_sqe+0x377/0x2130 io_uring/io_uring.c:1712
 io_queue_sqe io_uring/io_uring.c:1922 [inline]
 io_submit_sqe io_uring/io_uring.c:2177 [inline]
 io_submit_sqes+0x11bc/0x2f80 io_uring/io_uring.c:2294
 __do_sys_io_uring_enter io_uring/io_uring.c:3365 [inline]
 __se_sys_io_uring_enter+0x423/0x4aa0 io_uring/io_uring.c:3300
 __ia32_sys_io_uring_enter+0x11d/0x1a0 io_uring/io_uring.c:3300
 ia32_sys_call+0xd59/0x4180 arch/x86/include/generated/asm/syscalls_32.h:427
 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
 __do_fast_syscall_32+0xb0/0x110 arch/x86/entry/common.c:386
 do_fast_syscall_32+0x38/0x80 arch/x86/entry/common.c:411
 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:449
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e

Uninit was stored to memory at:
 io_sendmsg+0x691/0xe30 io_uring/net.c:554
 io_issue_sqe+0x377/0x2130 io_uring/io_uring.c:1712
 io_queue_sqe io_uring/io_uring.c:1922 [inline]
 io_submit_sqe io_uring/io_uring.c:2177 [inline]
 io_submit_sqes+0x11bc/0x2f80 io_uring/io_uring.c:2294
 __do_sys_io_uring_enter io_uring/io_uring.c:3365 [inline]
 __se_sys_io_uring_enter+0x423/0x4aa0 io_uring/io_uring.c:3300
 __ia32_sys_io_uring_enter+0x11d/0x1a0 io_uring/io_uring.c:3300
 ia32_sys_call+0xd59/0x4180 arch/x86/include/generated/asm/syscalls_32.h:427
 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
 __do_fast_syscall_32+0xb0/0x110 arch/x86/entry/common.c:386
 do_fast_syscall_32+0x38/0x80 arch/x86/entry/common.c:411
 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:449
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e

Uninit was created at:
 __alloc_pages_noprof+0x9a7/0xe00 mm/page_alloc.c:4774
 alloc_pages_mpol_noprof+0x299/0x990 mm/mempolicy.c:2265
 alloc_pages_noprof+0x1bf/0x1e0 mm/mempolicy.c:2345
 alloc_slab_page mm/slub.c:2412 [inline]
 allocate_slab+0x320/0x12e0 mm/slub.c:2578
 new_slab mm/slub.c:2631 [inline]
 ___slab_alloc+0x12ef/0x35e0 mm/slub.c:3818
 __kmem_cache_alloc_bulk mm/slub.c:4895 [inline]
 kmem_cache_alloc_bulk_noprof+0x486/0x1330 mm/slub.c:4967
 __io_alloc_req_refill+0x84/0x5b0 io_uring/io_uring.c:958
 io_alloc_req io_uring/io_uring.h:411 [inline]
 io_submit_sqes+0x9a2/0x2f80 io_uring/io_uring.c:2283
 __do_sys_io_uring_enter io_uring/io_uring.c:3365 [inline]
 __se_sys_io_uring_enter+0x423/0x4aa0 io_uring/io_uring.c:3300
 __ia32_sys_io_uring_enter+0x11d/0x1a0 io_uring/io_uring.c:3300
 ia32_sys_call+0xd59/0x4180 arch/x86/include/generated/asm/syscalls_32.h:427
 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
 __do_fast_syscall_32+0xb0/0x110 arch/x86/entry/common.c:386
 do_fast_syscall_32+0x38/0x80 arch/x86/entry/common.c:411
 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:449
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e

CPU: 1 UID: 0 PID: 7335 Comm: syz.4.564 Not tainted 6.12.0-syzkaller-01782-gbf9aa14fc523 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
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