[PATCH] efi_loader: variable: check a return value of uuid__str_to_bin()

[AKASHI Takahiro]

The only error case is that a given UUID is in wrong format.
So just return EFI_INVALID_PARAMETER here.
Signed-off-by: AKASHI Takahiro <takahiro.aka...@linaro.org>
Reported-by: Coverity (CID 300333)
---
 lib/efi_loader/efi_variable.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/lib/efi_loader/efi_variable.c b/lib/efi_loader/efi_variable.c
index f40b194b13bf..38d21b9314f2 100644
--- a/lib/efi_loader/efi_variable.c
+++ b/lib/efi_loader/efi_variable.c
@@ -866,7 +866,10 @@ static efi_status_t parse_uboot_variable(char *variable,
        /* guid */
        c = *(name - 1);
        *(name - 1) = '\0'; /* guid need be null-terminated here */
-       uuid_str_to_bin(guid, (unsigned char *)vendor, UUID_STR_FORMAT_GUID);
+       if (uuid_str_to_bin(guid, (unsigned char *)vendor,
+                           UUID_STR_FORMAT_GUID))
+               /* The only error would be EINVAL. */
+               return EFI_INVALID_PARAMETER;
        *(name - 1) = c;
 
        /* attributes */
-- 
2.25.2