This is a note to let you know that I've just added the patch titled
amd64_edac:__amd64_set_scrub_rate(): avoid overindexing scrubrates[]
to the 3.0-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
amd64_edac-__amd64_set_scrub_rate-avoid-overindexing-scrubrates.patch
and it can be found in the queue-3.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 168bfeef7bba3f9784f7540b053e4ac72b769ce9 Mon Sep 17 00:00:00 2001
From: Andrew Morton <[email protected]>
Date: Tue, 23 Oct 2012 14:09:39 -0700
Subject: amd64_edac:__amd64_set_scrub_rate(): avoid overindexing scrubrates[]
From: Andrew Morton <[email protected]>
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 <[email protected]>
Cc: Doug Thompson <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Borislav Petkov <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/edac/amd64_edac.c | 11 ++++-------
1 file changed, 4 insertions(+), 7 deletions(-)
--- a/drivers/edac/amd64_edac.c
+++ b/drivers/edac/amd64_edac.c
@@ -161,8 +161,11 @@ static int __amd64_set_scrub_rate(struct
* 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)
@@ -172,12 +175,6 @@ static int __amd64_set_scrub_rate(struct
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;
Patches currently in stable-queue which might be from [email protected]
are
queue-3.0/kernel-sys.c-fix-stack-memory-content-leak-via-uname26.patch
queue-3.0/amd64_edac-__amd64_set_scrub_rate-avoid-overindexing-scrubrates.patch
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