[PATCH v2 1/1] efi_loader: out of memory in efi_mem_carve_out

[Ilias Apalodimas]

On Sun, 30 Jul 2023 at 13:54, Heinrich Schuchardt
<heinrich.schuchardt at canonical.com> wrote:
>
> Handle out of memory situation in efi_mem_carve_out().
>
> Fixes: 5d00995c361c ("efi_loader: Implement memory allocation and map")
> Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt at canonical.com>
> ---
> v2:
>         non leak newlist
> ---
>  lib/efi_loader/efi_memory.c | 6 ++++++
>  1 file changed, 6 insertions(+)
>
> diff --git a/lib/efi_loader/efi_memory.c b/lib/efi_loader/efi_memory.c
> index 9de6cf6010..48d641d231 100644
> --- a/lib/efi_loader/efi_memory.c
> +++ b/lib/efi_loader/efi_memory.c
> @@ -34,6 +34,7 @@ struct efi_mem_list {
>  #define EFI_CARVE_NO_OVERLAP           -1
>  #define EFI_CARVE_LOOP_AGAIN           -2
>  #define EFI_CARVE_OVERLAPS_NONRAM      -3
> +#define EFI_CARVE_OUT_OF_RESOURCES     -4
>
>  /* This list contains all memory map items */
>  static LIST_HEAD(efi_mem);
> @@ -239,6 +240,8 @@ static s64 efi_mem_carve_out(struct efi_mem_list *map,
>
>         /* Create a new map from [ carve_start ... map_end ] */
>         newmap = calloc(1, sizeof(*newmap));
> +       if (!newmap)
> +               return EFI_CARVE_OUT_OF_RESOURCES;
>         newmap->desc = map->desc;
>         newmap->desc.physical_start = carve_start;
>         newmap->desc.virtual_start = carve_start;
> @@ -311,6 +314,9 @@ static efi_status_t efi_add_memory_map_pg(u64 start, u64 pages,
>                         r = efi_mem_carve_out(lmem, &newlist->desc,
>                                               overlap_only_ram);
>                         switch (r) {
> +                       case EFI_CARVE_OUT_OF_RESOURCES:
> +                               free(newlist);
> +                               return EFI_OUT_OF_RESOURCES;
>                         case EFI_CARVE_OVERLAPS_NONRAM:
>                                 /*
>                                  * The user requested to only have RAM overlaps,
> --
> 2.40.1
>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas at linaro.org>