efi/libstub: Check return value of efi_parse_options

efi_parse_options can fail if it is unable to allocate space for a copy
of the command line. Check the return value to make sure it succeeded.

Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu>
Link: https://lore.kernel.org/r/20200430182843.2510180-12-nivedita@alum.mit.edu
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>

diff --git a/drivers/firmware/efi/libstub/efi-stub.c b/drivers/firmware/efi/libstub/efi-stub.c
index 63541c2..c2484bf 100644 (file)
--- a/drivers/firmware/efi/libstub/efi-stub.c
+++ b/drivers/firmware/efi/libstub/efi-stub.c
@@ -207,11 +207,21 @@ efi_status_t efi_entry(efi_handle_t handle, efi_system_table_t *sys_table_arg)
 
        if (IS_ENABLED(CONFIG_CMDLINE_EXTEND) ||
            IS_ENABLED(CONFIG_CMDLINE_FORCE) ||
-           cmdline_size == 0)
-               efi_parse_options(CONFIG_CMDLINE);
+           cmdline_size == 0) {
+               status = efi_parse_options(CONFIG_CMDLINE);
+               if (status != EFI_SUCCESS) {
+                       efi_err("Failed to parse options\n");
+                       goto fail_free_cmdline;
+               }
+       }
 
-       if (!IS_ENABLED(CONFIG_CMDLINE_FORCE) && cmdline_size > 0)
-               efi_parse_options(cmdline_ptr);
+       if (!IS_ENABLED(CONFIG_CMDLINE_FORCE) && cmdline_size > 0) {
+               status = efi_parse_options(cmdline_ptr);
+               if (status != EFI_SUCCESS) {
+                       efi_err("Failed to parse options\n");
+                       goto fail_free_cmdline;
+               }
+       }
 
        efi_info("Booting Linux Kernel...\n");
 
@@ -223,7 +233,7 @@ efi_status_t efi_entry(efi_handle_t handle, efi_system_table_t *sys_table_arg)
                                     dram_base, image);
        if (status != EFI_SUCCESS) {
                efi_err("Failed to relocate kernel\n");
-               goto fail_free_cmdline;
+               goto fail_free_screeninfo;
        }
 
        efi_retrieve_tpm2_eventlog();
@@ -326,8 +336,9 @@ fail_free_initrd:
 fail_free_image:
        efi_free(image_size, image_addr);
        efi_free(reserve_size, reserve_addr);
-fail_free_cmdline:
+fail_free_screeninfo:
        free_screen_info(si);
+fail_free_cmdline:
        efi_free(cmdline_size, (unsigned long)cmdline_ptr);
 fail:
        return status;

diff --git a/drivers/firmware/efi/libstub/x86-stub.c b/drivers/firmware/efi/libstub/x86-stub.c
index c84c567..37154bb 100644 (file)
--- a/drivers/firmware/efi/libstub/x86-stub.c
+++ b/drivers/firmware/efi/libstub/x86-stub.c
@@ -739,12 +739,20 @@ unsigned long efi_main(efi_handle_t handle,
        }
 
 #ifdef CONFIG_CMDLINE_BOOL
-       efi_parse_options(CONFIG_CMDLINE);
+       status = efi_parse_options(CONFIG_CMDLINE);
+       if (status != EFI_SUCCESS) {
+               efi_err("Failed to parse options\n");
+               goto fail;
+       }
 #endif
        if (!IS_ENABLED(CONFIG_CMDLINE_OVERRIDE)) {
                unsigned long cmdline_paddr = ((u64)hdr->cmd_line_ptr |
                                               ((u64)boot_params->ext_cmd_line_ptr << 32));
-               efi_parse_options((char *)cmdline_paddr);
+               status = efi_parse_options((char *)cmdline_paddr);
+               if (status != EFI_SUCCESS) {
+                       efi_err("Failed to parse options\n");
+                       goto fail;
+               }
        }
 
        /*