This is a note to let you know that I've just added the patch titled
wmi: use memcmp instead of strncmp to compare GUIDs
to the 2.6.36-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:
wmi-use-memcmp-instead-of-strncmp-to-compare-guids.patch
and it can be found in the queue-2.6.36 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 8b14d7b22c61f17ccb869e0047d9df6dd9f50a9f Mon Sep 17 00:00:00 2001
From: Thadeu Lima de Souza Cascardo <[email protected]>
Date: Sun, 28 Nov 2010 19:46:50 -0200
Subject: wmi: use memcmp instead of strncmp to compare GUIDs
From: Thadeu Lima de Souza Cascardo <[email protected]>
commit 8b14d7b22c61f17ccb869e0047d9df6dd9f50a9f upstream.
While looking for the duplicates in /sys/class/wmi/, I couldn't find
them. The code that looks for duplicates uses strncmp in a binary GUID,
which may contain zero bytes. The right function is memcmp, which is
also used in another section of wmi code.
It was finding 49142400-C6A3-40FA-BADB-8A2652834100 as a duplicate of
39142400-C6A3-40FA-BADB-8A2652834100. Since the first byte is the fourth
printed, they were found as equal by strncmp.
Signed-off-by: Thadeu Lima de Souza Cascardo <[email protected]>
Signed-off-by: Matthew Garrett <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/platform/x86/wmi.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/platform/x86/wmi.c
+++ b/drivers/platform/x86/wmi.c
@@ -801,7 +801,7 @@ static bool guid_already_parsed(const ch
wblock = list_entry(p, struct wmi_block, list);
gblock = &wblock->gblock;
- if (strncmp(gblock->guid, guid_string, 16) == 0)
+ if (memcmp(gblock->guid, guid_string, 16) == 0)
return true;
}
return false;
Patches currently in stable-queue which might be from [email protected]
are
queue-2.6.36/wmi-use-memcmp-instead-of-strncmp-to-compare-guids.patch
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