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smbios: empty strings in smbios_add_string()

smbios_add_string() cannot deal with empty strings. This leads to incorrect
property values and invalid tables. E.g. for the pine64-lts_defconfig
CONFIG_SMBIOS_MANUFACTURER="". Linux command dmidecode shows:

Table 1:
    Manufacturer: sunxi
    Product Name: sunxi

Table 3:
    Invalid entry length (2). DMI table is broken! Stop.

Replace empty strings by "Unknown".

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Heinrich Schuchardt %!s(int64=4) %!d(string=hai) anos
pai
achega
00a871d34e
Modificáronse 1 ficheiros con 2 adicións e 0 borrados
  1. 2 0
      lib/smbios.c

+ 2 - 0
lib/smbios.c

@@ -31,6 +31,8 @@ static int smbios_add_string(char *start, const char *str)
 {
 	int i = 1;
 	char *p = start;
+	if (!*str)
+		str = "Unknown";
 
 	for (;;) {
 		if (!*p) {