From 1a241e050652472efa62b2b36ad2fa7f82427b83 Mon Sep 17 00:00:00 2001
From: Maxim Fomin <maxim@fomin.one>
Date: Wed, 28 Dec 2022 17:40:06 +0000
Subject: kern/fs: Fix possible integer overflow in i386-pc mode with large
 partitions

The i386-pc mode supports MBR partition scheme where maximum partition
size is 2 TiB. In case of large partitions left shift expression with
unsigned long int "length" object may cause integer overflow making
calculated partition size less than true value. This issue is fixed by
increasing the size of "length" integer type.

Reference:https://git.savannah.gnu.org/cgit/grub.git/commit?id=1a241e050652472efa62b2b36ad2fa7f82427b83
Conflict:NA

Signed-off-by: Maxim Fomin <maxim@fomin.one>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
---
 grub-core/kern/fs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/grub-core/kern/fs.c b/grub-core/kern/fs.c
index b950829..7ad0aaf 100644
--- a/grub-core/kern/fs.c
+++ b/grub-core/kern/fs.c
@@ -130,7 +130,7 @@ grub_fs_probe (grub_device_t device)
 struct grub_fs_block
 {
   grub_disk_addr_t offset;
-  unsigned long length;
+  grub_disk_addr_t length;
 };
 
 static grub_err_t
-- 
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