Linux Kernel bonding: fix xfrm real_dev null pointer dereference

From this webpage screenshot, we can extract the following key information about the vulnerability: 1. Vulnerability Description: - Title: bonding: fix xfrm real_dev null pointer dereference - Description: Fixes a null pointer dereference issue when xfrm's real_dev pointer is NULL. In encapsulation, xfrm may call xdo_dev_offload_ok(), and all callback functions assume that real_dev is set. 2. Context of the Issue: - Trigger Condition: In encapsulation, xfrm may call xdo_dev_offload_ok(), while all callback functions assume real_dev is set. - Example Trace: ``` kernel: BUG: unable to handle page fault for address: 0000000000001030 kernel: bond0: (slave eni0np1): making interface the new active one kernel: #PF: supervisor write access in kernel mode kernel: #PF: error_code(0x0002) - not-present page kernel: PGD 0 P4D 0 kernel: Oops: 0002 [1#] PREEMPT SMP kernel: CPU: 4 PID: 2237 Comm: ping Not tainted 6.7.7+ #12 kernel: Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-2.fc40 04/01/2014 kernel: RIP: 0010:nsim_ipsec_offload_ok+0xc/0x20 [netdevsim] kernel: bond0: (slave eni0np1): bond_ipsec_add_sa_all: failed to add SA kernel: Code: e0 0f 0b 48 83 7f 38 00 74 de 0f 0b 48 8b 47 08 48 8b 37 48 8b 78 40 e9 b2 e5 9a d7 66 90 0f 1f 44 00 00 48 8b 86 80 02 00 00 80 30 10 00 00 01 b8 01 00 00 00 c3 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00 0f 1f 80 00 00 00 00

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Linux Kernel bonding: fix xfrm real_dev null pointer dereference