From 0e1cadb05bba2293b4575c8cab275313d181d94f Mon Sep 17 00:00:00 2001 From: Roy Franz Date: Sun, 22 Sep 2013 15:45:38 -0700 Subject: [PATCH] efi: Allow efi_free() to be called with size of 0 Make efi_free() safely callable with size of 0, similar to free() being callable with NULL pointers, and do nothing in that case. Remove size checks that this makes redundant. This also avoids some size checks in the ARM EFI stub code that will be added as well. Signed-off-by: Roy Franz Signed-off-by: Matt Fleming --- arch/x86/boot/compressed/eboot.c | 3 +-- drivers/firmware/efi/efi-stub-helper.c | 3 +++ 2 files changed, 4 insertions(+), 2 deletions(-) diff --git a/arch/x86/boot/compressed/eboot.c b/arch/x86/boot/compressed/eboot.c index bf2c35d5ec1ff..ef2181a96d096 100644 --- a/arch/x86/boot/compressed/eboot.c +++ b/arch/x86/boot/compressed/eboot.c @@ -506,8 +506,7 @@ struct boot_params *make_boot_params(void *handle, efi_system_table_t *_table) return boot_params; fail2: - if (options_size) - efi_free(sys_table, options_size, hdr->cmd_line_ptr); + efi_free(sys_table, options_size, hdr->cmd_line_ptr); fail: efi_free(sys_table, 0x4000, (unsigned long)boot_params); return NULL; diff --git a/drivers/firmware/efi/efi-stub-helper.c b/drivers/firmware/efi/efi-stub-helper.c index b314bf7202722..fda510fa35794 100644 --- a/drivers/firmware/efi/efi-stub-helper.c +++ b/drivers/firmware/efi/efi-stub-helper.c @@ -255,6 +255,9 @@ static void efi_free(efi_system_table_t *sys_table_arg, unsigned long size, { unsigned long nr_pages; + if (!size) + return; + nr_pages = round_up(size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE; efi_call_phys2(sys_table_arg->boottime->free_pages, addr, nr_pages); } -- 2.47.2