From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Lidong Chen <lidong.chen@oracle.com>
Date: Fri, 22 Nov 2024 06:27:56 +0000
Subject: [PATCH] gettext: Integer overflow leads to heap OOB write or read

Calculation of ctx->grub_gettext_msg_list size in grub_mofile_open() may
overflow leading to subsequent OOB write or read. This patch fixes the
issue by replacing grub_zalloc() and explicit multiplication with
grub_calloc() which does the same thing in safe manner.

Fixes: CVE-2024-45776

Reported-by: Nils Langius <nils@langius.de>
Signed-off-by: Lidong Chen <lidong.chen@oracle.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
Reviewed-by: Alec Brown <alec.r.brown@oracle.com>
---
 grub-core/gettext/gettext.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/grub-core/gettext/gettext.c b/grub-core/gettext/gettext.c
index 465143cb6..c17040269 100644
--- a/grub-core/gettext/gettext.c
+++ b/grub-core/gettext/gettext.c
@@ -323,8 +323,8 @@ grub_mofile_open (struct grub_gettext_context *ctx,
   for (ctx->grub_gettext_max_log = 0; ctx->grub_gettext_max >> ctx->grub_gettext_max_log;
        ctx->grub_gettext_max_log++);
 
-  ctx->grub_gettext_msg_list = grub_zalloc (ctx->grub_gettext_max
-					    * sizeof (ctx->grub_gettext_msg_list[0]));
+  ctx->grub_gettext_msg_list = grub_calloc (ctx->grub_gettext_max,
+					    sizeof (ctx->grub_gettext_msg_list[0]));
   if (!ctx->grub_gettext_msg_list)
     {
       grub_file_close (fd);