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efi_loader: loosen buffer parameter check in efi_file_read 

When reading a directory, EFI_BUFFER_TOO_SMALL should be returned when
the supplied buffer is too small, so a use-case is to call
efi_file_read with *buffer_size=0 and buffer=NULL to obtain the needed
size before doing the actual read.

So move the buffer!=NULL check to after the buffer size has been checked.

This fix allows the Redhat shim fallback to run and e.g. Fedora 32 now
boots out of the box.

Signed-off-by: Stefan Sørensen <stefan.sorensen@spectralink.com>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
Stefan Sørensen 2020-07-22 09:43:31 +02:00 committed by Heinrich Schuchardt
parent 9b87d4429c
commit 1ef1cf1f93
1 changed files with 8 additions and 1 deletions
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9
lib/efi_loader/efi_file.c
View File

@ -349,6 +349,11 @@ static efi_status_t file_read(struct file_handle *fh, u64 *buffer_size,
efi_status_t ret;
loff_t file_size;
if (!buffer) {
ret = EFI_INVALID_PARAMETER;
return ret;
}
ret = efi_get_file_size(fh, &file_size);
if (ret != EFI_SUCCESS)
return ret;
@ -414,6 +419,8 @@ static efi_status_t dir_read(struct file_handle *fh, u64 *buffer_size,
fh->dent = dent;
return EFI_BUFFER_TOO_SMALL;
}
if (!buffer)
return EFI_INVALID_PARAMETER;
fh->dent = NULL;
*buffer_size = required_size;
@ -443,7 +450,7 @@ static efi_status_t EFIAPI efi_file_read(struct efi_file_handle *file,
EFI_ENTRY("%p, %p, %p", file, buffer_size, buffer);
if (!buffer_size || !buffer) {
if (!buffer_size) {
ret = EFI_INVALID_PARAMETER;
goto error;
}