syzbot

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BUG: KMSAN: uninit-value in sctp_assoc_bh_rcv+0x34e/0xbc0 net/sctp/associola.c:1005
 sctp_assoc_bh_rcv+0x34e/0xbc0 net/sctp/associola.c:1005
 sctp_inq_push+0x2a3/0x350 net/sctp/inqueue.c:88
 sctp_backlog_rcv+0x3c7/0xda0 net/sctp/input.c:331
 sk_backlog_rcv+0x13f/0x420 include/net/sock.h:1132
 __release_sock+0x1d3/0x330 net/core/sock.c:3163
 release_sock+0x6b/0x270 net/core/sock.c:3717
 sctp_wait_for_connect+0x458/0x820 net/sctp/socket.c:9366
 sctp_sendmsg_to_asoc+0x223a/0x2260 net/sctp/socket.c:1886
 sctp_sendmsg+0x3910/0x49f0 net/sctp/socket.c:2032
 inet_sendmsg+0x269/0x2a0 net/ipv4/af_inet.c:851
 sock_sendmsg_nosec net/socket.c:712 [inline]
 __sock_sendmsg+0x278/0x3d0 net/socket.c:727
 __sys_sendto+0x590/0x710 net/socket.c:2180
 __do_sys_sendto net/socket.c:2187 [inline]
 __se_sys_sendto net/socket.c:2183 [inline]
 __x64_sys_sendto+0x130/0x200 net/socket.c:2183
 x64_sys_call+0x3c0b/0x3db0 arch/x86/include/generated/asm/syscalls_64.h:45
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd9/0x1b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was created at:
 slab_post_alloc_hook mm/slub.c:4167 [inline]
 slab_alloc_node mm/slub.c:4210 [inline]
 __do_kmalloc_node mm/slub.c:4340 [inline]
 __kmalloc_node_track_caller_noprof+0x96d/0x12f0 mm/slub.c:4360
 kmalloc_reserve+0x22f/0x4b0 net/core/skbuff.c:599
 __alloc_skb+0x347/0x7d0 net/core/skbuff.c:668
 alloc_skb include/linux/skbuff.h:1340 [inline]
 sctp_packet_pack net/sctp/output.c:472 [inline]
 sctp_packet_transmit+0x189e/0x4560 net/sctp/output.c:621
 sctp_outq_flush_transports net/sctp/outqueue.c:1173 [inline]
 sctp_outq_flush+0x1c7d/0x67c0 net/sctp/outqueue.c:1221
 sctp_outq_uncork+0x9e/0xc0 net/sctp/outqueue.c:764
 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:-1 [inline]
 sctp_side_effects net/sctp/sm_sideeffect.c:1198 [inline]
 sctp_do_sm+0x8c8e/0x9720 net/sctp/sm_sideeffect.c:1169
 sctp_assoc_bh_rcv+0x88b/0xbc0 net/sctp/associola.c:1052
 sctp_inq_push+0x2a3/0x350 net/sctp/inqueue.c:88
 sctp_backlog_rcv+0x3c7/0xda0 net/sctp/input.c:331
 sk_backlog_rcv+0x13f/0x420 include/net/sock.h:1132
 __release_sock+0x1d3/0x330 net/core/sock.c:3163
 release_sock+0x6b/0x270 net/core/sock.c:3717
 sctp_wait_for_connect+0x458/0x820 net/sctp/socket.c:9366
 sctp_sendmsg_to_asoc+0x223a/0x2260 net/sctp/socket.c:1886
 sctp_sendmsg+0x3910/0x49f0 net/sctp/socket.c:2032
 inet_sendmsg+0x269/0x2a0 net/ipv4/af_inet.c:851
 sock_sendmsg_nosec net/socket.c:712 [inline]
 __sock_sendmsg+0x278/0x3d0 net/socket.c:727
 __sys_sendto+0x590/0x710 net/socket.c:2180
 __do_sys_sendto net/socket.c:2187 [inline]
 __se_sys_sendto net/socket.c:2183 [inline]
 __x64_sys_sendto+0x130/0x200 net/socket.c:2183
 x64_sys_call+0x3c0b/0x3db0 arch/x86/include/generated/asm/syscalls_64.h:45
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd9/0x1b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

CPU: 1 UID: 0 PID: 6835 Comm: syz.4.277 Tainted: G        W           6.15.0-rc3-syzkaller-00094-g02ddfb981de8 #0 PREEMPT(undef) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
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