[U-Boot] [RFC 1/1] efi_loader: check parameters of efi_file_open()

[Heinrich Schuchardt]

Check the parameters of efi_file_open().

Signed-off-by: Heinrich Schuchardt <xypron.glpk at gmx.de>
---
Hello Takahiro,

this patch is necessary to become more UEFI compliant. But it interferes
with your FAT patch series.

You might integrate the changes into the next version of you patch series.
Otherwise I keep the patch until your series is merged.

Best regards

Heinrich
---
 lib/efi_loader/efi_file.c | 30 ++++++++++++++++++++++++++----
 1 file changed, 26 insertions(+), 4 deletions(-)

diff --git a/lib/efi_loader/efi_file.c b/lib/efi_loader/efi_file.c
index 07696a8f56..8f04943670 100644
--- a/lib/efi_loader/efi_file.c
+++ b/lib/efi_loader/efi_file.c
@@ -202,15 +202,37 @@ static efi_status_t EFIAPI efi_file_open(struct efi_file_handle *file,
 		s16 *file_name, u64 open_mode, u64 attributes)
 {
 	struct file_handle *fh = to_fh(file);
+	efi_status_t ret;
 
 	EFI_ENTRY("%p, %p, \"%ls\", %llx, %llu", file, new_handle, file_name,
 		  open_mode, attributes);
 
-	*new_handle = file_open(fh->fs, fh, file_name, open_mode);
-	if (!*new_handle)
-		return EFI_EXIT(EFI_NOT_FOUND);
+	/* Check parameters */
+	if (!file || !file || !file_name) {
+		ret = EFI_INVALID_PARAMETER;
+		goto out;
+	}
+	if (open_mode != EFI_FILE_MODE_READ &&
+	    open_mode != (EFI_FILE_MODE_READ | EFI_FILE_MODE_WRITE) &&
+	    open_mode != (EFI_FILE_MODE_READ | EFI_FILE_MODE_WRITE |
+			 EFI_FILE_MODE_CREATE)) {
+		ret = EFI_INVALID_PARAMETER;
+		goto out;
+	}
+	if ((!(open_mode & EFI_FILE_MODE_CREATE) && attributes) ||
+	    (attributes & (EFI_FILE_READ_ONLY | ~EFI_FILE_VALID_ATTR))) {
+		ret = EFI_INVALID_PARAMETER;
+		goto out;
+	}
 
-	return EFI_EXIT(EFI_SUCCESS);
+	/* Open file */
+	*new_handle = file_open(fh->fs, fh, file_name, open_mode);
+	if (*new_handle)
+		ret = EFI_SUCCESS;
+	else
+		ret = EFI_NOT_FOUND;
+out:
+	return EFI_EXIT(ret);
 }
 
 static efi_status_t file_close(struct file_handle *fh)
-- 
2.18.0