linux-kernel - [082/103] [SCSI] Fix VPD inquiry page wrapper

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Message-Id: <20101022185234.713243789@clark.site>
Date:	Fri, 22 Oct 2010 11:51:56 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	James Bottomley <James.Bottomley@...e.de>
Subject: [082/103] [SCSI] Fix VPD inquiry page wrapper

2.6.35-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Martin K. Petersen <martin.petersen@...cle.com>

commit 16d3ea26f82271fef9b1c4523b5e1ea31fa39eec upstream.

Fix two bugs in the VPD page wrapper:

    - Don't return failure if the user asked for page 0

    - The end of buffer check failed to account for the page header size
      and consequently didn't work

Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: James Bottomley <James.Bottomley@...e.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/scsi/scsi.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/scsi/scsi.c
+++ b/drivers/scsi/scsi.c
@@ -1046,13 +1046,13 @@ int scsi_get_vpd_page(struct scsi_device
 
 	/* If the user actually wanted this page, we can skip the rest */
 	if (page == 0)
-		return -EINVAL;
+		return 0;
 
 	for (i = 0; i < min((int)buf[3], buf_len - 4); i++)
 		if (buf[i + 4] == page)
 			goto found;
 
-	if (i < buf[3] && i > buf_len)
+	if (i < buf[3] && i >= buf_len - 4)
 		/* ran off the end of the buffer, give us benefit of doubt */
 		goto found;
 	/* The device claims it doesn't support the requested page */


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