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efi_loader: fix 'efidebug boot dump'

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* Do not recreate a variable name that we already have as u16 string.
* Check the return value of malloc()
* EFI_NOT_FOUND cannot occur for a variable name returned by
  GetNextVariableName(). Remove a print statement.
* Don't copy a GUID for no reason.
* Don't use the run-time service table to call exported functions.
* Don't pass NULL to show_efi_boot_opt_data() (fixes Coverity CID 300338).

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
Heinrich Schuchardt 2020-04-29 19:20:35 +02:00
parent 661c02ceb2
commit b5f4e9e384
1 changed files with 20 additions and 25 deletions
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45
cmd/efidebug.c
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@ -682,13 +682,13 @@ static int do_efi_boot_rm(cmd_tbl_t *cmdtp, int flag,
/**
* show_efi_boot_opt_data() - dump UEFI load option
*
* @id: load option number
* @varname16: variable name
* @data: value of UEFI load option variable
* @size: size of the boot option
*
* Decode the value of UEFI load option variable and print information.
*/
static void show_efi_boot_opt_data(int id, void *data, size_t size)
static void show_efi_boot_opt_data(u16 *varname16, void *data, size_t size)
{
struct efi_load_option lo;
char *label, *p;
@ -705,8 +705,8 @@ static void show_efi_boot_opt_data(int id, void *data, size_t size)
p = label;
utf16_utf8_strncpy(&p, lo.label, label_len16);
printf("Boot%04X:\n", id);
printf(" attributes: %c%c%c (0x%08x)\n",
printf("%ls:\nattributes: %c%c%c (0x%08x)\n",
varname16,
/* ACTIVE */
lo.attributes & LOAD_OPTION_ACTIVE ? 'A' : '-',
/* FORCE RECONNECT */
@ -730,37 +730,32 @@ static void show_efi_boot_opt_data(int id, void *data, size_t size)
/**
* show_efi_boot_opt() - dump UEFI load option
*
* @id: Load option number
* @varname16: variable name
*
* Dump information defined by UEFI load option.
*/
static void show_efi_boot_opt(int id)
static void show_efi_boot_opt(u16 *varname16)
{
char var_name[9];
u16 var_name16[9], *p;
efi_guid_t guid;
void *data = NULL;
void *data;
efi_uintn_t size;
efi_status_t ret;
sprintf(var_name, "Boot%04X", id);
p = var_name16;
utf8_utf16_strncpy(&p, var_name, 9);
guid = efi_global_variable_guid;
size = 0;
ret = EFI_CALL(RT->get_variable(var_name16, &guid, NULL, &size, NULL));
ret = EFI_CALL(efi_get_variable(varname16, &efi_global_variable_guid,
NULL, &size, NULL));
if (ret == EFI_BUFFER_TOO_SMALL) {
data = malloc(size);
ret = EFI_CALL(RT->get_variable(var_name16, &guid, NULL, &size,
data));
if (!data) {
printf("ERROR: Out of memory\n");
return;
}
ret = EFI_CALL(efi_get_variable(varname16,
&efi_global_variable_guid,
NULL, &size, data));
if (ret == EFI_SUCCESS)
show_efi_boot_opt_data(varname16, data, size);
free(data);
}
if (ret == EFI_SUCCESS)
show_efi_boot_opt_data(id, data, size);
else if (ret == EFI_NOT_FOUND)
printf("Boot%04X: not found\n", id);
free(data);
}
static int u16_tohex(u16 c)
@ -839,7 +834,7 @@ static int do_efi_boot_dump(cmd_tbl_t *cmdtp, int flag,
id = (id << 4) + digit;
}
if (i == 4 && !var_name16[8])
show_efi_boot_opt(id);
show_efi_boot_opt(var_name16);
}
free(var_name16);