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efi_loader: correct reported length in GetNextVariable()

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The runtime service GetNextVariable() returns the length of the next
variable including the closing 0x0000. This length should be in bytes.

Comparing the output of EDK2 and U-Boot shows that this is currently not
correctly implemented:

EDK2:
OsIndicationsSupported: 46
PlatformLang: 26
PlatformLangCodes: 36

U-Boot:
OsIndicationsSupported: 23
PlatformLang: 13
PlatformLangCodes: 18

Provide correct length in GetNextVariable().

Fixes: d99a87f84b ("efi_loader: implement GetNextVariableName()")
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
Heinrich Schuchardt 2020-03-20 19:04:34 +01:00
parent 47a9596354
commit 4d7f5af841
1 changed files with 6 additions and 5 deletions
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11
lib/efi_loader/efi_variable.c
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@ -273,7 +273,8 @@ static efi_status_t parse_uboot_variable(char *variable,
u32 *attributes)
{
char *guid, *name, *end, c;
unsigned long name_len;
size_t name_len;
efi_uintn_t old_variable_name_size;
u16 *p;
guid = strchr(variable, '_');
@ -289,17 +290,17 @@ static efi_status_t parse_uboot_variable(char *variable,
return EFI_INVALID_PARAMETER;
name_len = end - name;
if (*variable_name_size < (name_len + 1)) {
*variable_name_size = name_len + 1;
old_variable_name_size = *variable_name_size;
*variable_name_size = sizeof(u16) * (name_len + 1);
if (old_variable_name_size < *variable_name_size)
return EFI_BUFFER_TOO_SMALL;
}
end++; /* point to value */
/* variable name */
p = variable_name;
utf8_utf16_strncpy(&p, name, name_len);
variable_name[name_len] = 0;
*variable_name_size = name_len + 1;
/* guid */
c = *(name - 1);