efi_loader: fix GetNextVariableName
Our current implementation of GetNextVariableName() first collects all EFI
variables. If none is found at all hexport_r() returns a zero length string
terminated by \0 and the value 1 as number of bytes in the returned buffer.
In this case GetNextVariableName() has to return EFI_NOT_FOUND.
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Alexander Graf <agraf@suse.de>
diff --git a/lib/efi_loader/efi_variable.c b/lib/efi_loader/efi_variable.c
index d94a5f6..e0d7f57 100644
--- a/lib/efi_loader/efi_variable.c
+++ b/lib/efi_loader/efi_variable.c
@@ -383,7 +383,8 @@
list_len = hexport_r(&env_htab, '\n',
H_MATCH_REGEX | H_MATCH_KEY,
&efi_variables_list, 0, 1, regexlist);
- if (list_len <= 0)
+ /* 1 indicates that no match was found */
+ if (list_len <= 1)
return EFI_EXIT(EFI_NOT_FOUND);
variable = efi_variables_list;