boot: fix memleaks in os-release parser

There is no guarantee that the os-release section contains each key only
once, nor any guarantee that all keys are present. Make sure we properly
free memory in both cases.

Not that it matters much, as we're short-living, anyway. But correct code
is always nicer to read..

1 files changed, 6 insertions, 3 deletions

diff --git a/src/boot/efi/boot.c b/src/boot/efi/boot.c
index eb1a4e3b66..861adff29f 100644
--- a/src/boot/efi/boot.c
+++ b/src/boot/efi/boot.c
@@ -1547,16 +1547,19 @@ static VOID config_entry_add_linux( Config *config, EFI_LOADED_IMAGE *loaded_ima
                         line = content;
                         while ((line = line_get_key_value(content, (CHAR8 *)"=", &pos, &key, &value))) {
                                 if (strcmpa((CHAR8 *)"PRETTY_NAME", key) == 0) {
+                                        FreePool(os_name);
                                         os_name = stra_to_str(value);
                                         continue;
                                 }
 
                                 if (strcmpa((CHAR8 *)"ID", key) == 0) {
+                                        FreePool(os_id);
                                         os_id = stra_to_str(value);
                                         continue;
                                 }
 
                                 if (strcmpa((CHAR8 *)"VERSION_ID", key) == 0) {
+                                        FreePool(os_version);
                                         os_version = stra_to_str(value);
                                         continue;
                                 }
@@ -1571,11 +1574,11 @@ static VOID config_entry_add_linux( Config *config, EFI_LOADED_IMAGE *loaded_ima
                                 config_entry_add_loader(config, loaded_image->DeviceHandle, LOADER_LINUX, conf, 'l', os_name, path);
                                 FreePool(conf);
                                 FreePool(path);
-                                FreePool(os_name);
-                                FreePool(os_id);
-                                FreePool(os_version);
                         }
 
+                        FreePool(os_name);
+                        FreePool(os_id);
+                        FreePool(os_version);
                         FreePool(content);
                 }
                 uefi_call_wrapper(linux_dir->Close, 1, linux_dir);