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dmi_scan: fix missing check for _DMI_ signature in smbios_present()

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commit a40e7cf8f0 upstream.

Commit 9f9c9cbb60 ("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@linux-foundation.org: fix build]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Reported-by: Tim McGrath <tmhikaru@gmail.com>
Tested-by: Tim Mcgrath <tmhikaru@gmail.com>
Cc: Zhenzhong Duan <zhenzhong.duan@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ben Hutchings 2013-03-08 12:43:32 -08:00 committed by Greg Kroah-Hartman
parent abf73cb191
commit d2c96b7257
1 changed files with 2 additions and 3 deletions
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5
drivers/firmware/dmi_scan.c
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@ -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)