Patch "bonding: fix xfrm real_dev null pointer dereference" has been added to the 6.6-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    bonding: fix xfrm real_dev null pointer dereference

to the 6.6-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     bonding-fix-xfrm-real_dev-null-pointer-dereference.patch
and it can be found in the queue-6.6 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 45b8bc6ae705316aa5f449a6863d97f640e263cf
Author: Nikolay Aleksandrov <razor@xxxxxxxxxxxxx>
Date:   Fri Aug 16 14:48:12 2024 +0300

    bonding: fix xfrm real_dev null pointer dereference
    
    [ Upstream commit f8cde9805981c50d0c029063dc7d82821806fc44 ]
    
    We shouldn't set real_dev to NULL because packets can be in transit and
    xfrm might call xdo_dev_offload_ok() in parallel. All callbacks 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 <83> 80 30 10 00 00 01 b8 01 00 00 00 c3 0f 1f 80 00 00 00 00 0f 1f
     kernel: bond0: (slave eni0np1): making interface the new active one
     kernel: RSP: 0018:ffffabde81553b98 EFLAGS: 00010246
     kernel: bond0: (slave eni0np1): bond_ipsec_add_sa_all: failed to add SA
     kernel:
     kernel: RAX: 0000000000000000 RBX: ffff9eb404e74900 RCX: ffff9eb403d97c60
     kernel: RDX: ffffffffc090de10 RSI: ffff9eb404e74900 RDI: ffff9eb3c5de9e00
     kernel: RBP: ffff9eb3c0a42000 R08: 0000000000000010 R09: 0000000000000014
     kernel: R10: 7974203030303030 R11: 3030303030303030 R12: 0000000000000000
     kernel: R13: ffff9eb3c5de9e00 R14: ffffabde81553cc8 R15: ffff9eb404c53000
     kernel: FS:  00007f2a77a3ad00(0000) GS:ffff9eb43bd00000(0000) knlGS:0000000000000000
     kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
     kernel: CR2: 0000000000001030 CR3: 00000001122ab000 CR4: 0000000000350ef0
     kernel: bond0: (slave eni0np1): making interface the new active one
     kernel: Call Trace:
     kernel:  <TASK>
     kernel:  ? __die+0x1f/0x60
     kernel: bond0: (slave eni0np1): bond_ipsec_add_sa_all: failed to add SA
     kernel:  ? page_fault_oops+0x142/0x4c0
     kernel:  ? do_user_addr_fault+0x65/0x670
     kernel:  ? kvm_read_and_reset_apf_flags+0x3b/0x50
     kernel: bond0: (slave eni0np1): making interface the new active one
     kernel:  ? exc_page_fault+0x7b/0x180
     kernel:  ? asm_exc_page_fault+0x22/0x30
     kernel:  ? nsim_bpf_uninit+0x50/0x50 [netdevsim]
     kernel: bond0: (slave eni0np1): bond_ipsec_add_sa_all: failed to add SA
     kernel:  ? nsim_ipsec_offload_ok+0xc/0x20 [netdevsim]
     kernel: bond0: (slave eni0np1): making interface the new active one
     kernel:  bond_ipsec_offload_ok+0x7b/0x90 [bonding]
     kernel:  xfrm_output+0x61/0x3b0
     kernel: bond0: (slave eni0np1): bond_ipsec_add_sa_all: failed to add SA
     kernel:  ip_push_pending_frames+0x56/0x80
    
    Fixes: 18cb261afd7b ("bonding: support hardware encryption offload to slaves")
    Signed-off-by: Nikolay Aleksandrov <razor@xxxxxxxxxxxxx>
    Reviewed-by: Hangbin Liu <liuhangbin@xxxxxxxxx>
    Signed-off-by: Paolo Abeni <pabeni@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index a6eb907a9a273..566b02ca78261 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -582,7 +582,6 @@ static void bond_ipsec_del_sa_all(struct bonding *bond)
 		} else {
 			slave->dev->xfrmdev_ops->xdo_dev_state_delete(ipsec->xs);
 		}
-		ipsec->xs->xso.real_dev = NULL;
 	}
 	spin_unlock_bh(&bond->ipsec_lock);
 	rcu_read_unlock();