linux-kernel - [PATCH 4.14 03/75] usb: musb: tusb6010: uninitialized data in tusb_fifo_write

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Message-Id: <20211004125031.645601957@linuxfoundation.org>
Date:   Mon,  4 Oct 2021 14:51:38 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dan Carpenter <dan.carpenter@...cle.com>
Subject: [PATCH 4.14 03/75] usb: musb: tusb6010: uninitialized data in tusb_fifo_write_unaligned()

From: Dan Carpenter <dan.carpenter@...cle.com>

commit 517c7bf99bad3d6b9360558414aae634b7472d80 upstream.

This is writing to the first 1 - 3 bytes of "val" and then writing all
four bytes to musb_writel().  The last byte is always going to be
garbage.  Zero out the last bytes instead.

Fixes: 550a7375fe72 ("USB: Add MUSB and TUSB support")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Cc: stable <stable@...r.kernel.org>
Link: https://lore.kernel.org/r/20210916135737.GI25094@kili
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/usb/musb/tusb6010.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/usb/musb/tusb6010.c
+++ b/drivers/usb/musb/tusb6010.c
@@ -193,6 +193,7 @@ tusb_fifo_write_unaligned(void __iomem *
 	}
 	if (len > 0) {
 		/* Write the rest 1 - 3 bytes to FIFO */
+		val = 0;
 		memcpy(&val, buf, len);
 		musb_writel(fifo, 0, val);
 	}