[ 3.5.yuz extended stable ] Patch "amd64_edac:__amd64_set_scrub_rate(): avoid overindexing" has been added to staging queue

[Herton Ronaldo Krzesinski]

This is a note to let you know that I have just added a patch titled

    amd64_edac:__amd64_set_scrub_rate(): avoid overindexing

to the linux-3.5.y-queue branch of the 3.5.yuz extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.5.y-queue

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.5.yuz tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Herton

------

>From c41e0bb334eb41b90440f0b2fa88622a331303d7 Mon Sep 17 00:00:00 2001
From: Andrew Morton <akpm at linux-foundation.org>
Date: Tue, 23 Oct 2012 14:09:39 -0700
Subject: [PATCH] amd64_edac:__amd64_set_scrub_rate(): avoid overindexing
 scrubrates[]

commit 168bfeef7bba3f9784f7540b053e4ac72b769ce9 upstream.

If none of the elements in scrubrates[] matches, this loop will cause
__amd64_set_scrub_rate() to incorrectly use the n+1th element.

As the function is designed to use the final scrubrates[] element in the
case of no match, we can fix this bug by simply terminating the array
search at the n-1th element.

Boris: this code is fragile anyway, see here why:
http://marc.info/?l=linux-kernel&m=135102834131236&w=2

It will be rewritten more robustly soonish.

Reported-by: Denis Kirjanov <kirjanov at gmail.com>
Cc: Doug Thompson <dougthompson at xmission.com>
Signed-off-by: Andrew Morton <akpm at linux-foundation.org>
Signed-off-by: Borislav Petkov <borislav.petkov at amd.com>
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski at canonical.com>
---
 drivers/edac/amd64_edac.c |   11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c
index 7be9b72..a814ea8 100644
--- a/drivers/edac/amd64_edac.c
+++ b/drivers/edac/amd64_edac.c
@@ -170,8 +170,11 @@ static int __amd64_set_scrub_rate(struct pci_dev *ctl, u32 new_bw, u32 min_rate)
 	 * memory controller and apply to register. Search for the first
 	 * bandwidth entry that is greater or equal than the setting requested
 	 * and program that. If at last entry, turn off DRAM scrubbing.
+	 *
+	 * If no suitable bandwidth is found, turn off DRAM scrubbing entirely
+	 * by falling back to the last element in scrubrates[].
 	 */
-	for (i = 0; i < ARRAY_SIZE(scrubrates); i++) {
+	for (i = 0; i < ARRAY_SIZE(scrubrates) - 1; i++) {
 		/*
 		 * skip scrub rates which aren't recommended
 		 * (see F10 BKDG, F3x58)
@@ -181,12 +184,6 @@ static int __amd64_set_scrub_rate(struct pci_dev *ctl, u32 new_bw, u32 min_rate)

 		if (scrubrates[i].bandwidth <= new_bw)
 			break;
-
-		/*
-		 * if no suitable bandwidth found, turn off DRAM scrubbing
-		 * entirely by falling back to the last element in the
-		 * scrubrates array.
-		 */
 	}

 	scrubval = scrubrates[i].scrubval;
--
1.7.9.5