===================================================== BUG: KMSAN: uninit-value in skb_zcopy_clear include/linux/skbuff.h:1875 [inline] BUG: KMSAN: uninit-value in skb_release_data+0x473/0x1130 net/core/skbuff.c:669 skb_zcopy_clear include/linux/skbuff.h:1875 [inline] skb_release_data+0x473/0x1130 net/core/skbuff.c:669 skb_release_all net/core/skbuff.c:742 [inline] __kfree_skb+0x62/0x240 net/core/skbuff.c:756 kfree_skb_reason+0xa3/0x2a0 net/core/skbuff.c:778 kfree_skb include/linux/skbuff.h:1375 [inline] packet_snd net/packet/af_packet.c:3086 [inline] packet_sendmsg+0x588d/0x7830 net/packet/af_packet.c:3104 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg net/socket.c:734 [inline] ____sys_sendmsg+0xabc/0xe90 net/socket.c:2492 ___sys_sendmsg+0x2a5/0x350 net/socket.c:2546 __sys_sendmsg+0x258/0x440 net/socket.c:2575 __compat_sys_sendmsg net/compat.c:347 [inline] __do_compat_sys_sendmsg net/compat.c:354 [inline] __se_compat_sys_sendmsg net/compat.c:351 [inline] __ia32_compat_sys_sendmsg+0x99/0xe0 net/compat.c:351 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x95/0xf0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203 do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:246 entry_SYSENTER_compat_after_hwframe+0x53/0x62 Uninit was created at: slab_post_alloc_hook mm/slab.h:755 [inline] slab_alloc_node mm/slub.c:3258 [inline] __kmalloc_node_track_caller+0x86c/0x1230 mm/slub.c:4995 kmalloc_reserve net/core/skbuff.c:354 [inline] __alloc_skb+0x34a/0xd70 net/core/skbuff.c:426 alloc_skb include/linux/skbuff.h:1426 [inline] alloc_skb_with_frags+0xb9/0xb80 net/core/skbuff.c:5992 sock_alloc_send_pskb+0xaa8/0xc30 net/core/sock.c:2662 packet_alloc_skb net/packet/af_packet.c:2921 [inline] packet_snd net/packet/af_packet.c:3016 [inline] packet_sendmsg+0x4c78/0x7830 net/packet/af_packet.c:3104 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg net/socket.c:734 [inline] ____sys_sendmsg+0xabc/0xe90 net/socket.c:2492 ___sys_sendmsg+0x2a5/0x350 net/socket.c:2546 __sys_sendmsg+0x258/0x440 net/socket.c:2575 __compat_sys_sendmsg net/compat.c:347 [inline] __do_compat_sys_sendmsg net/compat.c:354 [inline] __se_compat_sys_sendmsg net/compat.c:351 [inline] __ia32_compat_sys_sendmsg+0x99/0xe0 net/compat.c:351 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x95/0xf0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203 do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:246 entry_SYSENTER_compat_after_hwframe+0x53/0x62 CPU: 1 PID: 30192 Comm: syz-executor.2 Not tainted 5.19.0-rc4-syzkaller-31333-g97117d69c353 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022 =====================================================