Commit a7770ae1 authored by Jean Delvare's avatar Jean Delvare
Browse files

firmware: dmi_scan: Fix handling of empty DMI strings

The handling of empty DMI strings looks quite broken to me:
* Strings from 1 to 7 spaces are not considered empty.
* True empty DMI strings (string index set to 0) are not considered
  empty, and result in allocating a 0-char string.
* Strings with invalid index also result in allocating a 0-char
* Strings starting with 8 spaces are all considered empty, even if
  non-space characters follow (sounds like a weird thing to do, but
  I have actually seen occurrences of this in DMI tables before.)
* Strings which are considered empty are reported as 8 spaces,
  instead of being actually empty.

Some of these issues are the result of an off-by-one error in memcmp,
the rest is incorrect by design.

So let's get it square: missing strings and strings made of only
spaces, regardless of their length, should be treated as empty and
no memory should be allocated for them. All other strings are
non-empty and should be allocated.

Signed-off-by: default avatarJean Delvare <>
Fixes: 79da4721 ("x86: fix DMI out of memory problems")
Cc: Parag Warudkar <>
Cc: Ingo Molnar <>
Cc: Thomas Gleixner <>
parent 7117794f
......@@ -18,7 +18,7 @@ EXPORT_SYMBOL_GPL(dmi_kobj);
* of and an antecedent to, SMBIOS, which stands for System
* Management BIOS. See further:
static const char dmi_empty_string[] = " ";
static const char dmi_empty_string[] = "";
static u32 dmi_ver __initdata;
static u32 dmi_len;
......@@ -39,25 +39,21 @@ static int dmi_memdev_nr;
static const char * __init dmi_string_nosave(const struct dmi_header *dm, u8 s)
const u8 *bp = ((u8 *) dm) + dm->length;
const u8 *nsp;
if (s) {
while (s > 0 && *bp) {
while (--s > 0 && *bp)
bp += strlen(bp) + 1;
if (*bp != 0) {
size_t len = strlen(bp)+1;
size_t cmp_len = len > 8 ? 8 : len;
if (!memcmp(bp, dmi_empty_string, cmp_len))
return dmi_empty_string;
/* Strings containing only spaces are considered empty */
nsp = bp;
while (*nsp == ' ')
if (*nsp != '\0')
return bp;
return "";
return dmi_empty_string;
static const char * __init dmi_string(const struct dmi_header *dm, u8 s)
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