linux-kernel - Re: [syzbot] [input?] KASAN: stack-out-of-bounds Read in ft260_smbus

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Message-Id: <20260120054218.213265-1-aha310510@gmail.com>
Date: Tue, 20 Jan 2026 14:42:18 +0900
From: Jeongjun Park <aha310510@...il.com>
To: syzbot+64ca69977b37604cd6d9@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [input?] KASAN: stack-out-of-bounds Read in ft260_smbus_write

#syz test upstream master

---
 drivers/hid/hid-ft260.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/hid/hid-ft260.c b/drivers/hid/hid-ft260.c
index 333341e80b0e..acfd69ed71a0 100644
--- a/drivers/hid/hid-ft260.c
+++ b/drivers/hid/hid-ft260.c
@@ -471,7 +471,8 @@ static int ft260_smbus_write(struct ft260_device *dev, u8 addr, u8 cmd,
 	struct ft260_i2c_write_request_report *rep =
 		(struct ft260_i2c_write_request_report *)dev->write_buf;
 
-	if (data_len >= sizeof(rep->data))
+	if (data_len >= sizeof(rep->data) ||
+		data_len >= sizeof(data))
 		return -EINVAL;
 
 	rep->address = addr;
--