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wifi: rtw89: pci: validate sequence number of TX release report

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[ Upstream commit 957eda596c ]

Hardware rarely reports abnormal sequence number in TX release report,
which will access out-of-bounds of wd_ring->pages array, causing NULL
pointer dereference.

  BUG: kernel NULL pointer dereference, address: 0000000000000000
  #PF: supervisor read access in kernel mode
  #PF: error_code(0x0000) - not-present page
  PGD 0 P4D 0
  Oops: 0000 [#1] PREEMPT SMP NOPTI
  CPU: 1 PID: 1085 Comm: irq/129-rtw89_p Tainted: G S   U
             6.1.145-17510-g2f3369c91536 #1 (HASH:69e8 1)
  Call Trace:
   <IRQ>
   rtw89_pci_release_tx+0x18f/0x300 [rtw89_pci (HASH:4c83 2)]
   rtw89_pci_napi_poll+0xc2/0x190 [rtw89_pci (HASH:4c83 2)]
   net_rx_action+0xfc/0x460 net/core/dev.c:6578 net/core/dev.c:6645 net/core/dev.c:6759
   handle_softirqs+0xbe/0x290 kernel/softirq.c:601
   ? rtw89_pci_interrupt_threadfn+0xc5/0x350 [rtw89_pci (HASH:4c83 2)]
   __local_bh_enable_ip+0xeb/0x120 kernel/softirq.c:499 kernel/softirq.c:423
   </IRQ>
   <TASK>
   rtw89_pci_interrupt_threadfn+0xf8/0x350 [rtw89_pci (HASH:4c83 2)]
   ? irq_thread+0xa7/0x340 kernel/irq/manage.c:0
   irq_thread+0x177/0x340 kernel/irq/manage.c:1205 kernel/irq/manage.c:1314
   ? thaw_kernel_threads+0xb0/0xb0 kernel/irq/manage.c:1202
   ? irq_forced_thread_fn+0x80/0x80 kernel/irq/manage.c:1220
   kthread+0xea/0x110 kernel/kthread.c:376
   ? synchronize_irq+0x1a0/0x1a0 kernel/irq/manage.c:1287
   ? kthread_associate_blkcg+0x80/0x80 kernel/kthread.c:331
   ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
   </TASK>

To prevent crash, validate rpp_info.seq before using.

Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Link: https://patch.msgid.link/20260110022019.2254969-2-pkshih@realtek.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Ping-Ke Shih 2026-01-10 10:20:12 +08:00 • committed by Sasha Levin
commit ef7fa19809
1 changed files with 6 additions and 1 deletions
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