43 lines
1.4 KiB
Diff
43 lines
1.4 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
|
|
From: Daniel Axtens <dja@axtens.net>
|
|
Date: Mon, 18 Jan 2021 16:49:09 +1100
|
|
Subject: [PATCH] fs/nilfs2: Reject too-large keys
|
|
|
|
NILFS2 has up to 7 keys, per the data structure. Do not permit array
|
|
indices in excess of that.
|
|
|
|
This catches some OOB reads. I don't know how controllable the invalidly
|
|
read data is or if that could be used later in the program.
|
|
|
|
Signed-off-by: Daniel Axtens <dja@axtens.net>
|
|
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
|
|
---
|
|
grub-core/fs/nilfs2.c | 7 ++++++-
|
|
1 file changed, 6 insertions(+), 1 deletion(-)
|
|
|
|
diff --git a/grub-core/fs/nilfs2.c b/grub-core/fs/nilfs2.c
|
|
index 598a2a55b..61e8af9ff 100644
|
|
--- a/grub-core/fs/nilfs2.c
|
|
+++ b/grub-core/fs/nilfs2.c
|
|
@@ -569,6 +569,11 @@ grub_nilfs2_btree_lookup (struct grub_nilfs2_data *data,
|
|
static inline grub_uint64_t
|
|
grub_nilfs2_direct_lookup (struct grub_nilfs2_inode *inode, grub_uint64_t key)
|
|
{
|
|
+ if (1 + key > 6)
|
|
+ {
|
|
+ grub_error (GRUB_ERR_BAD_FS, "key is too large");
|
|
+ return 0xffffffffffffffff;
|
|
+ }
|
|
return grub_le_to_cpu64 (inode->i_bmap[1 + key]);
|
|
}
|
|
|
|
@@ -584,7 +589,7 @@ grub_nilfs2_bmap_lookup (struct grub_nilfs2_data *data,
|
|
{
|
|
grub_uint64_t ptr;
|
|
ptr = grub_nilfs2_direct_lookup (inode, key);
|
|
- if (need_translate)
|
|
+ if (ptr != ((grub_uint64_t) 0xffffffffffffffff) && need_translate)
|
|
ptr = grub_nilfs2_dat_translate (data, ptr);
|
|
return ptr;
|
|
}
|