CVE-2024-26863

In the Linux kernel, the following vulnerability has been resolved:

hsr: Fix uninit-value access in hsr_get_node()

KMSAN reported the following uninit-value access issue [1]:

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BUG: KMSAN: uninit-value in hsr_get_node+0xa2e/0xa40 net/hsr/hsr_framereg.c:246

hsr_get_node+0xa2e/0xa40 net/hsr/hsr_framereg.c:246

fill_frame_info net/hsr/hsr_forward.c:577 [inline]

hsr_forward_skb+0xe12/0x30e0 net/hsr/hsr_forward.c:615

hsr_dev_xmit+0x1a1/0x270 net/hsr/hsr_device.c:223

__netdev_start_xmit include/linux/netdevice.h:4940 [inline]

netdev_start_xmit include/linux/netdevice.h:4954 [inline]

xmit_one net/core/dev.c:3548 [inline]

dev_hard_start_xmit+0x247/0xa10 net/core/dev.c:3564

__dev_queue_xmit+0x33b8/0x5130 net/core/dev.c:4349

dev_queue_xmit include/linux/netdevice.h:3134 [inline]

packet_xmit+0x9c/0x6b0 net/packet/af_packet.c:276

packet_snd net/packet/af_packet.c:3087 [inline]

packet_sendmsg+0x8b1d/0x9f30 net/packet/af_packet.c:3119

sock_sendmsg_nosec net/socket.c:730 [inline]

__sock_sendmsg net/socket.c:745 [inline]

__sys_sendto+0x735/0xa10 net/socket.c:2191

__do_sys_sendto net/socket.c:2203 [inline]

__se_sys_sendto net/socket.c:2199 [inline]

__x64_sys_sendto+0x125/0x1c0 net/socket.c:2199

do_syscall_x64 arch/x86/entry/common.c:52 [inline]

do_syscall_64+0x6d/0x140 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+0x5e9/0xb10 mm/slub.c:3523

kmalloc_reserve+0x13d/0x4a0 net/core/skbuff.c:560

__alloc_skb+0x318/0x740 net/core/skbuff.c:651

alloc_skb include/linux/skbuff.h:1286 [inline]

alloc_skb_with_frags+0xc8/0xbd0 net/core/skbuff.c:6334

sock_alloc_send_pskb+0xa80/0xbf0 net/core/sock.c:2787

packet_alloc_skb net/packet/af_packet.c:2936 [inline]

packet_snd net/packet/af_packet.c:3030 [inline]

packet_sendmsg+0x70e8/0x9f30 net/packet/af_packet.c:3119

sock_sendmsg_nosec net/socket.c:730 [inline]

__sock_sendmsg net/socket.c:745 [inline]

__sys_sendto+0x735/0xa10 net/socket.c:2191

__do_sys_sendto net/socket.c:2203 [inline]

__se_sys_sendto net/socket.c:2199 [inline]

__x64_sys_sendto+0x125/0x1c0 net/socket.c:2199

do_syscall_x64 arch/x86/entry/common.c:52 [inline]

do_syscall_64+0x6d/0x140 arch/x86/entry/common.c:83

entry_SYSCALL_64_after_hwframe+0x63/0x6b

CPU: 1 PID: 5033 Comm: syz-executor334 Not tainted 6.7.0-syzkaller-00562-g9f8413c4a66f #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023

=====================================================

If the packet type ID field in the Ethernet header is either ETH_P_PRP or

ETH_P_HSR, but it is not followed by an HSR tag, hsr_get_skb_sequence_nr()

reads an invalid value as a sequence number. This causes the above issue.

This patch fixes the issue by returning NULL if the Ethernet header is not

followed by an HSR tag.