Subject: FAILED: patch "[PATCH] wifi: mt76: mt7915: bound the device EEPROM address before" failed to apply to 5.10-stable tree
To: hexlabsecurity@proton.me,nbd@nbd.name
Cc: <stable@vger.kernel.org>
From: <gregkh@linuxfoundation.org>
Date: Fri, 04 Sep 2026 06:48:58 +0200
Message-ID: <2026090458-lion-librarian-5f33@gregkh>
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The patch below does not apply to the 5.10-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.10.y
git checkout FETCH_HEAD
git cherry-pick -x 44b5adfe49499f53002737f5fe81d608c08122fc
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2026090458-lion-librarian-5f33@gregkh' --subject-prefix 'PATCH 5.10.y' 'HEAD^..'

Possible dependencies:


thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 44b5adfe49499f53002737f5fe81d608c08122fc Mon Sep 17 00:00:00 2001
From: Bryam Vargas <hexlabsecurity@proton.me>
Date: Thu, 25 Jun 2026 07:10:26 -0500
Subject: [PATCH] wifi: mt76: mt7915: bound the device EEPROM address before
 the EFUSE copy

mt7915_mcu_get_eeprom() copies a fixed EFUSE block into the driver's
dev->mt76.eeprom.data buffer at the offset reported by the MCU response
(res->addr, a device-controlled __le32) without checking it against the
buffer size. A malicious or malfunctioning device can report an arbitrary
address and drive a 16-byte out-of-bounds write past eeprom.data.

Reject a response whose address would place the copy outside eeprom.data
before deriving the destination pointer. Devices that echo the requested
in-bounds offset are unaffected.

Fixes: e57b7901469f ("mt76: add mac80211 driver for MT7915 PCIe-based chipsets")
Cc: stable@vger.kernel.org
Signed-off-by: Bryam Vargas <hexlabsecurity@proton.me>
Link: https://patch.msgid.link/20260625-b4-disp-16f99062-v1-1-aee52ecf61b9@proton.me
Signed-off-by: Felix Fietkau <nbd@nbd.name>

diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c b/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c
index e8fe86f93309..bbb2fedacb25 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c
@@ -2917,8 +2917,15 @@ int mt7915_mcu_get_eeprom(struct mt7915_dev *dev, u32 offset, u8 *read_buf)
 		return ret;
 
 	res = (struct mt7915_mcu_eeprom_info *)skb->data;
-	if (!buf)
-		buf = dev->mt76.eeprom.data + le32_to_cpu(res->addr);
+	if (!buf) {
+		u32 addr = le32_to_cpu(res->addr);
+
+		if (addr > dev->mt76.eeprom.size - MT7915_EEPROM_BLOCK_SIZE) {
+			dev_kfree_skb(skb);
+			return -EINVAL;
+		}
+		buf = dev->mt76.eeprom.data + addr;
+	}
 	memcpy(buf, res->data, MT7915_EEPROM_BLOCK_SIZE);
 
 	dev_kfree_skb(skb);