[ 3.5.y.z extended stable ] Patch "dmi_scan: fix missing check for _DMI_ signature in" has been added to staging queue
Luis Henriques
luis.henriques at canonical.com
Mon Mar 11 12:07:56 UTC 2013
This is a note to let you know that I have just added a patch titled
dmi_scan: fix missing check for _DMI_ signature in
to the linux-3.5.y-queue branch of the 3.5.y.z 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.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable
Thanks.
-Luis
------
>From c46103e6a6df72ca25ef6b9ed62c467a0cb2cd60 Mon Sep 17 00:00:00 2001
From: Ben Hutchings <ben at decadent.org.uk>
Date: Fri, 8 Mar 2013 12:43:32 -0800
Subject: [PATCH] dmi_scan: fix missing check for _DMI_ signature in
smbios_present()
commit a40e7cf8f06b4e322ba902e4e9f6a6b0c2daa907 upstream.
Commit 9f9c9cbb6057 ("drivers/firmware/dmi_scan.c: fetch dmi version
from SMBIOS if it exists") hoisted the check for "_DMI_" into
dmi_scan_machine(), which means that we don't bother to check for
"_DMI_" at offset 16 in an SMBIOS entry. smbios_present() may also call
dmi_present() for an address where we found "_SM_", if it failed further
validation.
Check for "_DMI_" in smbios_present() before calling dmi_present().
[akpm at linux-foundation.org: fix build]
Signed-off-by: Ben Hutchings <ben at decadent.org.uk>
Reported-by: Tim McGrath <tmhikaru at gmail.com>
Tested-by: Tim Mcgrath <tmhikaru at gmail.com>
Cc: Zhenzhong Duan <zhenzhong.duan at oracle.com>
Signed-off-by: Andrew Morton <akpm at linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds at linux-foundation.org>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
drivers/firmware/dmi_scan.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/drivers/firmware/dmi_scan.c b/drivers/firmware/dmi_scan.c
index 982f1f5..4cd392d 100644
--- a/drivers/firmware/dmi_scan.c
+++ b/drivers/firmware/dmi_scan.c
@@ -442,7 +442,6 @@ static int __init dmi_present(const char __iomem *p)
static int __init smbios_present(const char __iomem *p)
{
u8 buf[32];
- int offset = 0;
memcpy_fromio(buf, p, 32);
if ((buf[5] < 32) && dmi_checksum(buf, buf[5])) {
@@ -461,9 +460,9 @@ static int __init smbios_present(const char __iomem *p)
dmi_ver = 0x0206;
break;
}
- offset = 16;
+ return memcmp(p + 16, "_DMI_", 5) || dmi_present(p + 16);
}
- return dmi_present(buf + offset);
+ return 1;
}
void __init dmi_scan_machine(void)
--
1.8.1.2
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