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From df2505c4c3cf42b0c419c99a5f9e1ce63e5a5938 Mon Sep 17 00:00:00 2001
From: Daniel Axtens <dja@axtens.net>
Date: Mon, 11 Jan 2021 17:30:42 +1100
Subject: [PATCH] script/execute: Avoid crash when using "$#" outside a
function scope
"$#" represents the number of arguments to a function. It is only
defined in a function scope, where "scope" is non-NULL. Currently,
if we attempt to evaluate "$#" outside a function scope, "scope" will
be NULL and we will crash with a NULL pointer dereference.
Do not attempt to count arguments for "$#" if "scope" is NULL. This
will result in "$#" being interpreted as an empty string if evaluated
outside a function scope.
Signed-off-by: Daniel Axtens <dja@axtens.net>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
Upstream-Status: Backport [https://git.savannah.gnu.org/cgit/grub.git/commit/?id=fe0586347ee46f927ae27bb9673532da9f5dead5]
Signed-off-by: Marta Rybczynska <marta.rybczynska@huawei.com>
---
grub-core/script/execute.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/grub-core/script/execute.c b/grub-core/script/execute.c
index 5ea2aef..23d34bd 100644
--- a/grub-core/script/execute.c
+++ b/grub-core/script/execute.c
@@ -485,7 +485,7 @@ gettext_putvar (const char *str, grub_size_t len,
return 0;
/* Enough for any number. */
- if (len == 1 && str[0] == '#')
+ if (len == 1 && str[0] == '#' && scope != NULL)
{
grub_snprintf (*ptr, 30, "%u", scope->argv.argc);
*ptr += grub_strlen (*ptr);
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