From ae451cb921126aa965abfe79c8716b7367c690de Mon Sep 17 00:00:00 2001

From: Lubomir Rintel <lkundrak@v3.sk>

Date: Wed, 27 Nov 2013 16:59:48 +0100

Subject: [PATCH 12/41] grub: Fix a crash with kernel line without being

 preceded by title

Quite obviously this implies a broken configuration file where a lone kernel

line is found without ever seeing an entry start, resulting in a NULL

dereference attempt. Reproducible by running GRUB code against extlinux

configuration:

./grubby --grub -c test/extlinux.1 --default-kernel

grubby received SIGSEGV!  Backtrace (6):

...

Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>

---

 grubby.c | 2 +-

 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/grubby.c b/grubby.c

index 21c5044..3cded58 100644

--- a/grubby.c

+++ b/grubby.c

@@ -1193,7 +1193,7 @@ static struct grubConfig * readConfig(const char * inName,

 	     * lines came earlier in the template, make sure to use LT_HYPER 

 	     * instead of LT_KERNEL now

 	     */

-	    if (entry->multiboot)

+	    if (entry && entry->multiboot)

 		line->type = LT_HYPER;

         } else if (line->type == LT_MBMODULE) {

-- 

2.4.3