net: libwx: properly reset Rx ring descriptor

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

net: libwx: properly reset Rx ring descriptor

When device reset is triggered by feature changes such as toggling Rx

VLAN offload, wx->do_reset() is called to reinitialize Rx rings. The

hardware descriptor ring may retain stale values from previous sessions.

And only set the length to 0 in rx_desc[0] would result in building

malformed SKBs. Fix it to ensure a clean slate after device reset.

[ 549.186435] [ C16] ------------[ cut here ]------------

[ 549.186457] [ C16] kernel BUG at net/core/skbuff.c:2814!

[ 549.186468] [ C16] Oops: invalid opcode: 0000 [#1] SMP NOPTI

[ 549.186472] [ C16] CPU: 16 UID: 0 PID: 0 Comm: swapper/16 Kdump: loaded Not tainted 6.16.0-rc4+ #23 PREEMPT(voluntary)

[ 549.186476] [ C16] Hardware name: Micro-Star International Co., Ltd. MS-7E16/X670E GAMING PLUS WIFI (MS-7E16), BIOS 1.90 12/31/2024

[ 549.186478] [ C16] RIP: 0010:__pskb_pull_tail+0x3ff/0x510

[ 549.186484] [ C16] Code: 06 f0 ff 4f 34 74 7b 4d 8b 8c 24 c8 00 00 00 45 8b 84 24 c0 00 00 00 e9 c8 fd ff ff 48 c7 44 24 08 00 00 00 00 e9 5e fe ff ff <0f> 0b 31 c0 e9 23 90 5b ff 41 f7 c6 ff 0f 00 00 75 bf 49 8b 06 a8

[ 549.186487] [ C16] RSP: 0018:ffffb391c0640d70 EFLAGS: 00010282

[ 549.186490] [ C16] RAX: 00000000fffffff2 RBX: ffff8fe7e4d40200 RCX: 00000000fffffff2

[ 549.186492] [ C16] RDX: ffff8fe7c3a4bf8e RSI: 0000000000000180 RDI: ffff8fe7c3a4bf40

[ 549.186494] [ C16] RBP: ffffb391c0640da8 R08: ffff8fe7c3a4c0c0 R09: 000000000000000e

[ 549.186496] [ C16] R10: ffffb391c0640d88 R11: 000000000000000e R12: ffff8fe7e4d40200

[ 549.186497] [ C16] R13: 00000000fffffff2 R14: ffff8fe7fa01a000 R15: 00000000fffffff2

[ 549.186499] [ C16] FS: 0000000000000000(0000) GS:ffff8fef5ae40000(0000) knlGS:0000000000000000

[ 549.186502] [ C16] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

[ 549.186503] [ C16] CR2: 00007f77d81d6000 CR3: 000000051a032000 CR4: 0000000000750ef0

[ 549.186505] [ C16] PKRU: 55555554

[ 549.186507] [ C16] Call Trace:

[ 549.186510] [ C16] <IRQ>

[ 549.186513] [ C16] ? srso_alias_return_thunk+0x5/0xfbef5

[ 549.186517] [ C16] __skb_pad+0xc7/0xf0

[ 549.186523] [ C16] wx_clean_rx_irq+0x355/0x3b0 [libwx]

[ 549.186533] [ C16] wx_poll+0x92/0x120 [libwx]

[ 549.186540] [ C16] __napi_poll+0x28/0x190

[ 549.186544] [ C16] net_rx_action+0x301/0x3f0

[ 549.186548] [ C16] ? srso_alias_return_thunk+0x5/0xfbef5

[ 549.186551] [ C16] ? __raw_spin_lock_irqsave+0x1e/0x50

[ 549.186554] [ C16] ? srso_alias_return_thunk+0x5/0xfbef5

[ 549.186557] [ C16] ? wake_up_nohz_cpu+0x35/0x160

[ 549.186559] [ C16] ? srso_alias_return_thunk+0x5/0xfbef5

[ 549.186563] [ C16] handle_softirqs+0xf9/0x2c0

[ 549.186568] [ C16] __irq_exit_rcu+0xc7/0x130

[ 549.186572] [ C16] common_interrupt+0xb8/0xd0

[ 549.186576] [ C16] </IRQ>

[ 549.186577] [ C16] <TASK>

[ 549.186579] [ C16] asm_common_interrupt+0x22/0x40

[ 549.186582] [ C16] RIP: 0010:cpuidle_enter_state+0xc2/0x420

[ 549.186585] [ C16] Code: 00 00 e8 11 0e 5e ff e8 ac f0 ff ff 49 89 c5 0f 1f 44 00 00 31 ff e8 0d ed 5c ff 45 84 ff 0f 85 40 02 00 00 fb 0f 1f 44 00 00 <45> 85 f6 0f 88 84 01 00 00 49 63 d6 48 8d 04 52 48 8d 04 82 49 8d

[ 549.186587] [ C16] RSP: 0018:ffffb391c0277e78 EFLAGS: 00000246

[ 549.186590] [ C16] RAX: ffff8fef5ae40000 RBX: 0000000000000003 RCX: 0000000000000000

[ 549.186591] [ C16] RDX: 0000007fde0faac5 RSI: ffffffff826e53f6 RDI: ffffffff826fa9b3

[ 549.186593] [ C16] RBP: ffff8fe7c3a20800 R08: 0000000000000002 R09: 0000000000000000

[ 549.186595] [ C16] R10: 0000000000000000 R11: 000000000000ffff R12: ffffffff82ed7a40

[ 549.186596] [ C16] R13: 0000007fde0faac5 R14: 0000000000000003 R15: 0000000000000000

[ 549.186601] [ C16] ? cpuidle_enter_state+0xb3/0x420

[ 549.186605] [ C16] cpuidle_en

---truncated---