grub: add a fix for a NULL pointer dereference

This patch adds a fix for a NULL pointer dereference in grub's
script/execute. It is a part of a security series [1].

[1] https://lists.gnu.org/archive/html/grub-devel/2021-03/msg00007.html

(From OE-Core rev: ddf62ae472c3c26af7a4c91e4216c8d5ba4604ac)

Signed-off-by: Marta Rybczynska <marta.rybczynska@huawei.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 29 insertions, 0 deletions

diff --git a/meta/recipes-bsp/grub/files/0044-script-execute-Fix-NULL-dereference-in-grub_script_e.patch b/meta/recipes-bsp/grub/files/0044-script-execute-Fix-NULL-dereference-in-grub_script_e.patch
new file mode 100644
index 0000000000..b279222fff
--- /dev/null
+++ b/meta/recipes-bsp/grub/files/0044-script-execute-Fix-NULL-dereference-in-grub_script_e.patch
@@ -0,0 +1,28 @@
+From f5fb56954e5926ced42a980c3e0842ffd5fea2aa Mon Sep 17 00:00:00 2001
+From: Daniel Axtens <dja@axtens.net>
+Date: Fri, 3 Apr 2020 23:05:13 +1100
+Subject: [PATCH] script/execute: Fix NULL dereference in
+ grub_script_execute_cmdline()
+
+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=41ae93b2e6c75453514629bcfe684300e3aec0ce]
+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 7e028e1..5ea2aef 100644
+--- a/grub-core/script/execute.c
++++ b/grub-core/script/execute.c
+@@ -940,7 +940,7 @@ grub_script_execute_cmdline (struct grub_script_cmd *cmd)
+   struct grub_script_argv argv = { 0, 0, 0 };
+ 
+   /* Lookup the command.  */
+-  if (grub_script_arglist_to_argv (cmdline->arglist, &argv) || ! argv.args[0])
++  if (grub_script_arglist_to_argv (cmdline->arglist, &argv) || ! argv.args || ! argv.args[0])
+     return grub_errno;
+ 
+   for (i = 0; i < argv.argc; i++)
diff --git a/meta/recipes-bsp/grub/grub2.inc b/meta/recipes-bsp/grub/grub2.inc
index 2f230065b2..84b8b8d1be 100644
--- a/meta/recipes-bsp/grub/grub2.inc
+++ b/meta/recipes-bsp/grub/grub2.inc
@@ -90,6 +90,7 @@ SRC_URI = "${GNU_MIRROR}/grub/grub-${PV}.tar.gz \
            file://0041-util-grub-install-Fix-NULL-pointer-dereferences.patch \
            file://0042-util-grub-editenv-Fix-incorrect-casting-of-a-signed-.patch \
            file://0043-util-glue-efi-Fix-incorrect-use-of-a-possibly-negati.patch \
+           file://0044-script-execute-Fix-NULL-dereference-in-grub_script_e.patch \
            "
 SRC_URI[md5sum] = "5ce674ca6b2612d8939b9e6abed32934"
 SRC_URI[sha256sum] = "f10c85ae3e204dbaec39ae22fa3c5e99f0665417e91c2cb49b7e5031658ba6ea"