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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Paul Menzel <pmenzel@molgen.mpg.de>
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Date: Tue, 23 Oct 2018 15:00:13 +0200
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Subject: [PATCH] unix/platform: Initialize variable to fix grub-install on
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UEFI system
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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On a UEFI system, were no boot entry *grub* is present, currently,
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`grub-install` fails with an error.
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$ efibootmgr
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BootCurrent: 0000
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Timeout: 0 seconds
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BootOrder: 0001,0006,0003,0004,0005
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Boot0001 Diskette Drive
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Boot0003* USB Storage Device
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Boot0004* CD/DVD/CD-RW Drive
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Boot0005 Onboard NIC
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Boot0006* WDC WD2500AAKX-75U6AA0
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$ sudo grub-install /dev/sda
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Installing for x86_64-efi platform.
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grub-install: error: efibootmgr failed to register the boot entry: Unknown error 22020.
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The error code is always different, and the error message (incorrectly)
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points to efibootmgr.
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But, the error is in GRUB’s function
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`grub_install_remove_efi_entries_by_distributor()`, where the variable
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`rc` for the return value, is uninitialized and never set, when no boot
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entry for the distributor is found.
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The content of that uninitialized variable is then returned as the error
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code of efibootmgr.
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Set the variable to 0, so that success is returned, when no entry needs
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to be deleted.
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Tested on Dell OptiPlex 7010 with firmware A28.
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$ sudo ./grub-install /dev/sda
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Installing for x86_64-efi platform.
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Installation finished. No error reported.
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[1]: https://github.com/rhboot/efibootmgr/issues/100
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Signed-off-by: Paul Menzel <pmenzel@molgen.mpg.de>
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Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
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---
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grub-core/osdep/unix/platform.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/grub-core/osdep/unix/platform.c b/grub-core/osdep/unix/platform.c
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index ca448bc11a0..55b8f401624 100644
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--- a/grub-core/osdep/unix/platform.c
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+++ b/grub-core/osdep/unix/platform.c
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@@ -85,7 +85,7 @@ grub_install_remove_efi_entries_by_distributor (const char *efi_distributor)
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pid_t pid = grub_util_exec_pipe ((const char * []){ "efibootmgr", NULL }, &fd;;
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char *line = NULL;
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size_t len = 0;
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- int rc;
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+ int rc = 0;
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if (!pid)
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{
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