linux-kernel - Re: [syzbot] [input?] [usb?] KMSAN: uninit-value in asus_report

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Message-ID: <tencent_9FA58DAAA5CF0D8B9250DDB2DDF4192FCF07@qq.com>
Date: Tue, 28 May 2024 20:28:53 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+07762f019fd03d01f04c@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [input?] [usb?] KMSAN: uninit-value in asus_report_fixup

please test uv asus_report_fixup

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 70ec81c2e2b4

diff --git a/drivers/hid/hid-asus.c b/drivers/hid/hid-asus.c
index 02de2bf4f790..1a92392967fc 100644
--- a/drivers/hid/hid-asus.c
+++ b/drivers/hid/hid-asus.c
@@ -1204,8 +1204,9 @@ static __u8 *asus_report_fixup(struct hid_device *hdev, __u8 *rdesc,
 	}
 
 	/* match many more n-key devices */
-	if (drvdata->quirks & QUIRK_ROG_NKEY_KEYBOARD) {
-		for (int i = 0; i < *rsize + 1; i++) {
+	printk("rdesc: %c.%c.%c.%c.%c, %s\n", rdesc[0], rdesc[1], rdesc[2], rdesc[3], rdesc[4], __func__);
+	if (drvdata->quirks & QUIRK_ROG_NKEY_KEYBOARD && *rsize > 15) {
+		for (int i = 0; i < *rsize - 14; i++) {
 			/* offset to the count from 0x5a report part always 14 */
 			if (rdesc[i] == 0x85 && rdesc[i + 1] == 0x5a &&
 			    rdesc[i + 14] == 0x95 && rdesc[i + 15] == 0x05) {
diff --git a/drivers/hid/usbhid/hid-core.c b/drivers/hid/usbhid/hid-core.c
index a90ed2ceae84..9f0e09f667b1 100644
--- a/drivers/hid/usbhid/hid-core.c
+++ b/drivers/hid/usbhid/hid-core.c
@@ -1029,7 +1029,7 @@ static int usbhid_parse(struct hid_device *hid)
 		return -EINVAL;
 	}
 
-	rdesc = kmalloc(rsize, GFP_KERNEL);
+	rdesc = kzalloc(rsize, GFP_KERNEL);
 	if (!rdesc)
 		return -ENOMEM;