linux-kernel - syztest

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Message-ID: <20250726204144.107432-1-contact@arnaud-lcm.com>
Date: Sat, 26 Jul 2025 21:41:44 +0100
From: Arnaud Lecomte <contact@...aud-lcm.com>
To: syzbot+52c1a7d3e5b361ccd346@...kaller.appspotmail.com
Cc: linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-usb@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: syztest

#syz test

--- a/drivers/hid/hid-mcp2221.c
+++ b/drivers/hid/hid-mcp2221.c
@@ -814,6 +814,10 @@ static int mcp2221_raw_event(struct hid_device *hdev,
 			}
 			if (data[2] == MCP2221_I2C_READ_COMPL ||
 			    data[2] == MCP2221_I2C_READ_PARTIAL) {
+				if (!mcp->rxbuf || mcp->rxbuf_idx < 0 || data[3] > 60) {
+					mcp->status = -EINVAL;
+					break;
+				}	
 				buf = mcp->rxbuf;
 				memcpy(&buf[mcp->rxbuf_idx], &data[4], data[3]);
 				mcp->rxbuf_idx = mcp->rxbuf_idx + data[3];
--