CVE-2024-56648

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> net: hsr: avoid potential out-of-bound access in fill_frame_info()<br /> <br /> syzbot is able to feed a packet with 14 bytes, pretending<br /> it is a vlan one.<br /> <br /> Since fill_frame_info() is relying on skb-&gt;mac_len already,<br /> extend the check to cover this case.<br /> <br /> BUG: KMSAN: uninit-value in fill_frame_info net/hsr/hsr_forward.c:709 [inline]<br /> BUG: KMSAN: uninit-value in hsr_forward_skb+0x9ee/0x3b10 net/hsr/hsr_forward.c:724<br /> fill_frame_info net/hsr/hsr_forward.c:709 [inline]<br /> hsr_forward_skb+0x9ee/0x3b10 net/hsr/hsr_forward.c:724<br /> hsr_dev_xmit+0x2f0/0x350 net/hsr/hsr_device.c:235<br /> __netdev_start_xmit include/linux/netdevice.h:5002 [inline]<br /> netdev_start_xmit include/linux/netdevice.h:5011 [inline]<br /> xmit_one net/core/dev.c:3590 [inline]<br /> dev_hard_start_xmit+0x247/0xa20 net/core/dev.c:3606<br /> __dev_queue_xmit+0x366a/0x57d0 net/core/dev.c:4434<br /> dev_queue_xmit include/linux/netdevice.h:3168 [inline]<br /> packet_xmit+0x9c/0x6c0 net/packet/af_packet.c:276<br /> packet_snd net/packet/af_packet.c:3146 [inline]<br /> packet_sendmsg+0x91ae/0xa6f0 net/packet/af_packet.c:3178<br /> sock_sendmsg_nosec net/socket.c:711 [inline]<br /> __sock_sendmsg+0x30f/0x380 net/socket.c:726<br /> __sys_sendto+0x594/0x750 net/socket.c:2197<br /> __do_sys_sendto net/socket.c:2204 [inline]<br /> __se_sys_sendto net/socket.c:2200 [inline]<br /> __x64_sys_sendto+0x125/0x1d0 net/socket.c:2200<br /> x64_sys_call+0x346a/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:45<br /> do_syscall_x64 arch/x86/entry/common.c:52 [inline]<br /> do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83<br /> entry_SYSCALL_64_after_hwframe+0x77/0x7f<br /> <br /> Uninit was created at:<br /> slab_post_alloc_hook mm/slub.c:4091 [inline]<br /> slab_alloc_node mm/slub.c:4134 [inline]<br /> kmem_cache_alloc_node_noprof+0x6bf/0xb80 mm/slub.c:4186<br /> kmalloc_reserve+0x13d/0x4a0 net/core/skbuff.c:587<br /> __alloc_skb+0x363/0x7b0 net/core/skbuff.c:678<br /> alloc_skb include/linux/skbuff.h:1323 [inline]<br /> alloc_skb_with_frags+0xc8/0xd00 net/core/skbuff.c:6612<br /> sock_alloc_send_pskb+0xa81/0xbf0 net/core/sock.c:2881<br /> packet_alloc_skb net/packet/af_packet.c:2995 [inline]<br /> packet_snd net/packet/af_packet.c:3089 [inline]<br /> packet_sendmsg+0x74c6/0xa6f0 net/packet/af_packet.c:3178<br /> sock_sendmsg_nosec net/socket.c:711 [inline]<br /> __sock_sendmsg+0x30f/0x380 net/socket.c:726<br /> __sys_sendto+0x594/0x750 net/socket.c:2197<br /> __do_sys_sendto net/socket.c:2204 [inline]<br /> __se_sys_sendto net/socket.c:2200 [inline]<br /> __x64_sys_sendto+0x125/0x1d0 net/socket.c:2200<br /> x64_sys_call+0x346a/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:45<br /> do_syscall_x64 arch/x86/entry/common.c:52 [inline]<br /> do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83<br /> entry_SYSCALL_64_after_hwframe+0x77/0x7f