[PATCH master 11/39] efi: loader: fix multiple bugs in efi_loader_bootm

[Ahmad Fatoum <a.fatoum@pengutronix.de>]

Fix several issues:

- ERR_PTR(-efi_errno(ret)) uses 'ret' which is 0 at that point
  instead of 'efiret' which holds the actual error.

- Two return statements (PTR_ERR(fdt) and efi_install_fdt error)
  bypass the 'out:' cleanup label, leaking file_path, load_option,
  and the source sdram region. Replace with goto out.

- efi_set_watchdog() and __efi_start_image() return efi_status_t
  (unsigned long, 64-bit on ARM64) but were stored in 'int ret',
  truncating the value. Use 'efiret' for these calls. Also fix the
  success return path to convert efiret properly.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
---
 efi/loader/bootm.c | 22 ++++++++++++----------
 1 file changed, 12 insertions(+), 10 deletions(-)

diff --git a/efi/loader/bootm.c b/efi/loader/bootm.c
index da664847def8..a74002e292f7 100644
--- a/efi/loader/bootm.c
+++ b/efi/loader/bootm.c
@@ -233,19 +233,21 @@ static int efi_loader_bootm(struct image_data *data)
 	efiret = efi_init_obj_list();
 	if (efiret) {
 		pr_err("Cannot initialize UEFI sub-system: %pe\n",
-			ERR_PTR(-efi_errno(ret)));
+			ERR_PTR(-efi_errno(efiret)));
 		goto out;
 	}
 
 	ret = -EINVAL;
 
 	fdt = bootm_get_devicetree(data);
-	if (IS_ERR(fdt))
-		return PTR_ERR(fdt);
+	if (IS_ERR(fdt)) {
+		ret = PTR_ERR(fdt);
+		goto out;
+	}
 	if (fdt) {
 		ret = efi_install_fdt(fdt);
 		if (ret)
-			return ret;
+			goto out;
 	}
 
 	efiret = efi_install_initrd(data, source);
@@ -280,17 +282,17 @@ static int efi_loader_bootm(struct image_data *data)
 	 * Unified Extensible Firmware Interface (UEFI), version 2.7 Errata A
 	 * 7.5. Miscellaneous Boot Services - EFI_BOOT_SERVICES.SetWatchdogTimer
 	 */
-	ret = efi_set_watchdog(300);
-	if (ret != EFI_SUCCESS) {
+	efiret = efi_set_watchdog(300);
+	if (efiret != EFI_SUCCESS) {
 		pr_err("failed to set watchdog timer\n");
 		goto out;
 	}
 
 	/* Call our payload! */
-	ret = __efi_start_image(handle, &exit_data_size, &exit_data, flags);
-	if (ret != EFI_SUCCESS) {
+	efiret = __efi_start_image(handle, &exit_data_size, &exit_data, flags);
+	if (efiret != EFI_SUCCESS) {
 		pr_err("## Application failed, r = %lu\n",
-			ret & ~EFI_ERROR_MASK);
+			efiret & ~EFI_ERROR_MASK);
 		if (exit_data) {
 			pr_err("## %ls\n", exit_data);
 			efi_free_pool(exit_data);
@@ -311,7 +313,7 @@ static int efi_loader_bootm(struct image_data *data)
 	/* Control is returned to us, disable EFI watchdog */
 	efi_set_watchdog(0);
 
-	return ret;
+	return -efi_errno(efiret);
 
 out:
 	efi_initrd_unregister();
-- 
2.47.3