From: Alan Stern <stern@rowland.harvard.edu>
Date: Mon, 7 Dec 2009 21:47:43 +0000 (-0500)
Subject: USB: usb-storage: fix bug in fill_inquiry
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=f3f6faa9edf67c1018270793e0547b0f81abb47e;p=openwrt%2Fstaging%2Fblogic.git

USB: usb-storage: fix bug in fill_inquiry

This patch (as1312) fixes a minor bug in usb-storage.  The
fill_inquiry() routine neglects to pre-load the inquiry data buffer
with spaces.  As a result, if the vendor name is shorter than 8
characters or the product name is shorter than 16, the remainder will
be filled with garbage.

The patch also removes some unnecessary calls to strlen().

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/drivers/usb/storage/usb.c b/drivers/usb/storage/usb.c
index f5c0264caa33..5a53d4f0dd11 100644
--- a/drivers/usb/storage/usb.c
+++ b/drivers/usb/storage/usb.c
@@ -232,6 +232,7 @@ void fill_inquiry_response(struct us_data *us, unsigned char *data,
 	if (data_len<36) // You lose.
 		return;
 
+	memset(data+8, ' ', 28);
 	if(data[0]&0x20) { /* USB device currently not connected. Return
 			      peripheral qualifier 001b ("...however, the
 			      physical device is not currently connected
@@ -241,15 +242,15 @@ void fill_inquiry_response(struct us_data *us, unsigned char *data,
 			      device, it may return zeros or ASCII spaces 
 			      (20h) in those fields until the data is
 			      available from the device."). */
-		memset(data+8,0,28);
 	} else {
 		u16 bcdDevice = le16_to_cpu(us->pusb_dev->descriptor.bcdDevice);
-		memcpy(data+8, us->unusual_dev->vendorName, 
-			strlen(us->unusual_dev->vendorName) > 8 ? 8 :
-			strlen(us->unusual_dev->vendorName));
-		memcpy(data+16, us->unusual_dev->productName, 
-			strlen(us->unusual_dev->productName) > 16 ? 16 :
-			strlen(us->unusual_dev->productName));
+		int n;
+
+		n = strlen(us->unusual_dev->vendorName);
+		memcpy(data+8, us->unusual_dev->vendorName, min(8, n));
+		n = strlen(us->unusual_dev->productName);
+		memcpy(data+16, us->unusual_dev->productName, min(16, n));
+
 		data[32] = 0x30 + ((bcdDevice>>12) & 0x0F);
 		data[33] = 0x30 + ((bcdDevice>>8) & 0x0F);
 		data[34] = 0x30 + ((bcdDevice>>4) & 0x0F);