30 lines
1.0 KiB
Diff
30 lines
1.0 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
|
|
From: Daniel Axtens <dja@axtens.net>
|
|
Date: Fri, 22 Jan 2021 18:13:56 +1100
|
|
Subject: [PATCH] fs/hfsplus: Don't fetch a key beyond the end of the node
|
|
|
|
Otherwise you get a wild pointer, leading to a bunch of invalid reads.
|
|
Check it falls inside the given node.
|
|
|
|
Signed-off-by: Daniel Axtens <dja@axtens.net>
|
|
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
|
|
---
|
|
grub-core/fs/hfsplus.c | 4 ++++
|
|
1 file changed, 4 insertions(+)
|
|
|
|
diff --git a/grub-core/fs/hfsplus.c b/grub-core/fs/hfsplus.c
|
|
index 03a33ea24..423f4b956 100644
|
|
--- a/grub-core/fs/hfsplus.c
|
|
+++ b/grub-core/fs/hfsplus.c
|
|
@@ -635,6 +635,10 @@ grub_hfsplus_btree_search (struct grub_hfsplus_btree *btree,
|
|
pointer = ((char *) currkey
|
|
+ grub_be_to_cpu16 (currkey->keylen)
|
|
+ 2);
|
|
+
|
|
+ if ((char *) pointer > node + btree->nodesize - 2)
|
|
+ return grub_error (GRUB_ERR_BAD_FS, "HFS+ key beyond end of node");
|
|
+
|
|
currnode = grub_be_to_cpu32 (grub_get_unaligned32 (pointer));
|
|
match = 1;
|
|
}
|