From: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
Subject: dmi_scan: fix missing check for _DMI_ signature in smbios_present()
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@xxxxxxxxxxxxxxxxxxxx: fix build]
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
Reported-by: Tim McGrath <tmhikaru@xxxxxxxxx>
Tested-by: Tim Mcgrath <tmhikaru@xxxxxxxxx>
Cc: Zhenzhong Duan <zhenzhong.duan@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/firmware/dmi_scan.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff -puN drivers/firmware/dmi_scan.c~dmi_scan-fix-missing-check-for-_dmi_-signature-in-smbios_present drivers/firmware/dmi_scan.c
--- a/drivers/firmware/dmi_scan.c~dmi_scan-fix-missing-check-for-_dmi_-signature-in-smbios_present
+++ a/drivers/firmware/dmi_scan.c
@@ -442,7 +442,6 @@ static int __init dmi_present(const char
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 c
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)
_
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