Subject: FAILED: patch "[PATCH] wifi: mt76: mt7996: validate default EEPROM firmware size" failed to apply to 6.12-stable tree
To: acharyalaxman8848@gmail.com,nbd@nbd.name
Cc: <stable@vger.kernel.org>
From: <gregkh@linuxfoundation.org>
Date: Fri, 04 Sep 2026 06:49:32 +0200
Message-ID: <2026090431-charred-eggnog-c271@gregkh>
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The patch below does not apply to the 6.12-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-6.12.y
git checkout FETCH_HEAD
git cherry-pick -x 653c6e289b13cc6942f3e8f8e3c568e70fa42d1f
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2026090431-charred-eggnog-c271@gregkh' --subject-prefix 'PATCH 6.12.y' 'HEAD^..'

Possible dependencies:


thanks,

greg k-h

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

From 653c6e289b13cc6942f3e8f8e3c568e70fa42d1f Mon Sep 17 00:00:00 2001
From: Laxman Acharya Padhya <acharyalaxman8848@gmail.com>
Date: Mon, 13 Jul 2026 17:39:12 +0545
Subject: [PATCH] wifi: mt76: mt7996: validate default EEPROM firmware size

The default EEPROM firmware is parsed and copied as a full EEPROM
without checking its length. A truncated file can make the driver
read beyond the firmware buffer during variant validation or the
fallback copy.

Reject files shorter than MT7996_EEPROM_SIZE before parsing or
copying the firmware.

Fixes: 98686cd21624 ("wifi: mt76: mt7996: add driver for MediaTek Wi-Fi 7 (802.11be) devices")
Cc: stable@vger.kernel.org
Signed-off-by: Laxman Acharya Padhya <acharyalaxman8848@gmail.com>
Link: https://patch.msgid.link/20260713115412.67095-1-acharyalaxman8848@gmail.com
Signed-off-by: Felix Fietkau <nbd@nbd.name>

diff --git a/drivers/net/wireless/mediatek/mt76/mt7996/eeprom.c b/drivers/net/wireless/mediatek/mt76/mt7996/eeprom.c
index ac05f7d75d63..ec33521db564 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7996/eeprom.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7996/eeprom.c
@@ -150,6 +150,12 @@ mt7996_eeprom_check_or_use_default(struct mt7996_dev *dev, bool use_default)
 		goto out;
 	}
 
+	if (fw->size < MT7996_EEPROM_SIZE) {
+		dev_err(dev->mt76.dev, "Invalid default bin size\n");
+		ret = -EINVAL;
+		goto out;
+	}
+
 	if (!use_default && mt7996_eeprom_variant_valid(dev, fw->data))
 		goto out;