2021-03-30 15:50:09 +00:00
|
|
|
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
|
|
|
|
|
From: Daniel Axtens <dja@axtens.net>
|
|
|
|
|
Date: Mon, 18 Jan 2021 14:51:11 +1100
|
|
|
|
|
Subject: [PATCH] fs/jfs: Do not move to leaf level if name length is negative
|
|
|
|
|
|
|
|
|
|
Fuzzing JFS revealed crashes where a negative number would be passed
|
|
|
|
|
to le_to_cpu16_copy(). There it would be cast to a large positive number
|
|
|
|
|
and the copy would read and write off the end of the respective buffers.
|
|
|
|
|
|
|
|
|
|
Catch this at the top as well as the bottom of the loop.
|
|
|
|
|
|
|
|
|
|
Signed-off-by: Daniel Axtens <dja@axtens.net>
|
|
|
|
|
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
|
|
|
|
|
---
|
|
|
|
|
grub-core/fs/jfs.c | 2 +-
|
|
|
|
|
1 file changed, 1 insertion(+), 1 deletion(-)
|
|
|
|
|
|
|
|
|
|
diff --git a/grub-core/fs/jfs.c b/grub-core/fs/jfs.c
|
2022-03-29 18:03:52 +00:00
|
|
|
index aab3e8c7b..1819899bd 100644
|
2021-03-30 15:50:09 +00:00
|
|
|
--- a/grub-core/fs/jfs.c
|
|
|
|
|
+++ b/grub-core/fs/jfs.c
|
|
|
|
|
@@ -563,7 +563,7 @@ grub_jfs_getent (struct grub_jfs_diropen *diro)
|
|
|
|
|
|
|
|
|
|
/* Move down to the leaf level. */
|
|
|
|
|
nextent = leaf->next;
|
|
|
|
|
- if (leaf->next != 255)
|
|
|
|
|
+ if (leaf->next != 255 && len > 0)
|
|
|
|
|
do
|
|
|
|
|
{
|
|
|
|
|
next_leaf = &diro->next_leaf[nextent];
|
