syzbot

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BUG: KMSAN: uninit-value in af_alg_free_sg+0x1a7/0x270 crypto/af_alg.c:547
 af_alg_free_sg+0x1a7/0x270 crypto/af_alg.c:547
 hash_sendmsg+0x1938/0x1c30 crypto/algif_hash.c:172
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg net/socket.c:745 [inline]
 ____sys_sendmsg+0x9c2/0xd60 net/socket.c:2584
 ___sys_sendmsg+0x28d/0x3c0 net/socket.c:2638
 __sys_sendmmsg+0x3c4/0x950 net/socket.c:2724
 __do_sys_sendmmsg net/socket.c:2753 [inline]
 __se_sys_sendmmsg net/socket.c:2750 [inline]
 __x64_sys_sendmmsg+0xbc/0x120 net/socket.c:2750
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x44/0x110 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

Uninit was created at:
 slab_post_alloc_hook+0x129/0xa70 mm/slab.h:768
 slab_alloc_node mm/slub.c:3478 [inline]
 __kmem_cache_alloc_node+0x5c9/0x970 mm/slub.c:3517
 __do_kmalloc_node mm/slab_common.c:1006 [inline]
 __kmalloc+0x121/0x3c0 mm/slab_common.c:1020
 kmalloc include/linux/slab.h:604 [inline]
 sock_kmalloc+0x128/0x1c0 net/core/sock.c:2681
 hash_accept_parent_nokey crypto/algif_hash.c:418 [inline]
 hash_accept_parent+0xbf/0x430 crypto/algif_hash.c:445
 af_alg_accept+0x1fc/0x810 crypto/af_alg.c:439
 hash_accept+0x340/0x790 crypto/algif_hash.c:254
 do_accept+0x606/0xa80 net/socket.c:1927
 __sys_accept4_file net/socket.c:1967 [inline]
 __sys_accept4+0x18e/0x360 net/socket.c:1997
 __do_sys_accept net/socket.c:2014 [inline]
 __se_sys_accept net/socket.c:2011 [inline]
 __x64_sys_accept+0x95/0xf0 net/socket.c:2011
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x44/0x110 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

CPU: 1 PID: 5001 Comm: syz-executor300 Not tainted 6.7.0-rc4-syzkaller-00039-g9ace34a8e446 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
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