FAILED: patch "[PATCH] platform/x86: think-lmi: Fix certificate thumbprint sysfs" failed to apply to 6.1-stable tree

FAILED: patch "[PATCH] platform/x86: think-lmi: Fix certificate thumbprint sysfs" failed to apply to 6.1-stable tree

[gregkh]

The patch below does not apply to the 6.1-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-6.1.y
git checkout FETCH_HEAD
git cherry-pick -x 4f3183f5ae9b8ddfe338d79a96146a05342bbe50
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2026090327-banknote-slogan-6f7e@gregkh' --subject-prefix 'PATCH 6.1.y' 'HEAD^..'

Possible dependencies:



thanks,

greg k-h

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

From 4f3183f5ae9b8ddfe338d79a96146a05342bbe50 Mon Sep 17 00:00:00 2001
From: Thorsten Blum <thorsten.blum@linux.dev>
Date: Mon, 10 Aug 2026 14:05:57 +0200
Subject: [PATCH] platform/x86: think-lmi: Fix certificate thumbprint sysfs
 output
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

cert_thumbprint() already returns the accumulated output length, but
certificate_thumbprint_show() adds that value to count again, making the
next line use the wrong offset. Errors returned by cert_thumbprint() are
also ignored and their negative values added to count.

Assign the total length to count instead and propagate errors correctly.

Fixes: b49f72e7f96d ("platform/x86: think-lmi: Certificate authentication support")
Cc: stable@vger.kernel.org
Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
Reviewed-by: Mark Pearson <mpearson-lenovo@squebb.ca>
Link: https://patch.msgid.link/20260810120556.149416-2-thorsten.blum@linux.dev
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>

diff --git a/drivers/platform/x86/lenovo/think-lmi.c b/drivers/platform/x86/lenovo/think-lmi.c
index e3e683bf3469..ca266657e16c 100644
--- a/drivers/platform/x86/lenovo/think-lmi.c
+++ b/drivers/platform/x86/lenovo/think-lmi.c
@@ -745,6 +745,8 @@ static ssize_t certificate_thumbprint_show(struct kobject *kobj, struct kobj_att
 		return -EOPNOTSUPP;
 
 	for (i = 0; i < ARRAY_SIZE(thumbtypes); i++) {
+		ssize_t ret;
+
 		if (tlmi_priv.pwdcfg.core.password_mode >= TLMI_PWDCFG_MODE_MULTICERT) {
 			/* Format: 'SVC | SMC, Thumbtype' */
 			wmistr = kasprintf(GFP_KERNEL, "%s,%s",
@@ -756,8 +758,12 @@ static ssize_t certificate_thumbprint_show(struct kobject *kobj, struct kobj_att
 		}
 		if (!wmistr)
 			return -ENOMEM;
-		count += cert_thumbprint(buf, wmistr, count);
+
+		ret = cert_thumbprint(buf, wmistr, count);
 		kfree(wmistr);
+		if (ret < 0)
+			return ret;
+		count = ret;
 	}
 
 	return count;

[PATCH 6.1.y] platform/x86: think-lmi: Fix certificate thumbprint sysfs output

[Sasha Levin]

From: Thorsten Blum <thorsten.blum@linux.dev>

[ Upstream commit 4f3183f5ae9b8ddfe338d79a96146a05342bbe50 ]

cert_thumbprint() already returns the accumulated output length, but
certificate_thumbprint_show() adds that value to count again, making the
next line use the wrong offset. Errors returned by cert_thumbprint() are
also ignored and their negative values added to count.

Assign the total length to count instead and propagate errors correctly.

Fixes: b49f72e7f96d ("platform/x86: think-lmi: Certificate authentication support")
Cc: stable@vger.kernel.org
Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
Reviewed-by: Mark Pearson <mpearson-lenovo@squebb.ca>
Link: https://patch.msgid.link/20260810120556.149416-2-thorsten.blum@linux.dev
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
[ Adapted upstream loop changes to the older driver’s three explicit cert_thumbprint() calls. ]
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/platform/x86/think-lmi.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/platform/x86/think-lmi.c b/drivers/platform/x86/think-lmi.c
index e7605bc97f2b0..31f545a2f0a58 100644
--- a/drivers/platform/x86/think-lmi.c
+++ b/drivers/platform/x86/think-lmi.c
@@ -681,9 +681,15 @@ static ssize_t certificate_thumbprint_show(struct kobject *kobj, struct kobj_att
 	if (!tlmi_priv.certificate_support || !setting->cert_installed)
 		return -EOPNOTSUPP;
 
-	count += cert_thumbprint(buf, "Md5", count);
-	count += cert_thumbprint(buf, "Sha1", count);
-	count += cert_thumbprint(buf, "Sha256", count);
+	count = cert_thumbprint(buf, "Md5", count);
+	if (count < 0)
+		return count;
+
+	count = cert_thumbprint(buf, "Sha1", count);
+	if (count < 0)
+		return count;
+
+	count = cert_thumbprint(buf, "Sha256", count);
 	return count;
 }
 
-- 
2.53.0