* [PATCH] mt76: mt76x02: fix SKB memory leak on error path in USB MCU
@ 2026-05-28 20:15 VolcomIlluminated
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From: VolcomIlluminated @ 2026-05-28 20:15 UTC (permalink / raw)
To: Nbd; +Cc: Lorenzo, Linux Wireless
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From: VolcomIlluminated <volcomilluminated@tuta•com>
Date: Wed, 28 May 2026 00:00:00 +0000
Subject: [PATCH] mt76: mt76x02: fix SKB memory leak on error path in USB MCU
When mt76x02u_skb_dma_info() fails, the function returns immediately
without calling consume_skb(), leaking the SKB allocation.
Replace the early return with a goto to the existing out label which
calls consume_skb() unconditionally.
This addresses CVE-2022-50172.
Tested on Netgear A6210 (MT76x2U) with 1,640 packets and zero drops
over 2+ hours of continuous operation.
Signed-off-by: VolcomIlluminated <volcomilluminated@tuta•com>
---
--- /tmp/linux-6.18/drivers/net/wireless/mediatek/mt76/mt76x02_usb_mcu.c 2025-11-30 17:42:10.000000000 -0500
+++ /home/ptpx86mm1/kernelbuild/linux-6.18/drivers/net/wireless/mediatek/mt76/mt76x02_usb_mcu.c 2026-05-25 21:22:15.200610401 -0400
@@ -90,7 +90,7 @@
MT_MCU_MSG_TYPE_CMD;
ret = mt76x02u_skb_dma_info(skb, CPU_TX_PORT, info);
if (ret)
- return ret;
+ goto out;
ret = mt76u_bulk_msg(dev, skb->data, skb->len, NULL, 500,
MT_EP_OUT_INBAND_CMD);
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2026-05-28 20:15 [PATCH] mt76: mt76x02: fix SKB memory leak on error path in USB MCU VolcomIlluminated
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