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From 7c1813eeec78892fa651046cc224ae4e80d0c94d Mon Sep 17 00:00:00 2001
From: Darren Kenny <darren.kenny@oracle.com>
Date: Fri, 23 Oct 2020 17:09:31 +0000
Subject: [PATCH] hfsplus: Check that the volume name length is valid
HFS+ documentation suggests that the maximum filename and volume name is
255 Unicode characters in length.
So, when converting from big-endian to little-endian, we should ensure
that the name of the volume has a length that is between 0 and 255,
inclusive.
Fixes: CID 73641
Signed-off-by: Darren Kenny <darren.kenny@oracle.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
Upstream-Status: Backport [https://git.savannah.gnu.org/cgit/grub.git/commit/?id=2298f6e0d951251bb9ca97d891d1bc8b74515f8c]
Signed-off-by: Marta Rybczynska <marta.rybczynska@huawei.com>
---
grub-core/fs/hfsplus.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/grub-core/fs/hfsplus.c b/grub-core/fs/hfsplus.c
index dae43be..03c3c4c 100644
--- a/grub-core/fs/hfsplus.c
+++ b/grub-core/fs/hfsplus.c
@@ -1007,6 +1007,15 @@ grub_hfsplus_label (grub_device_t device, char **label)
grub_hfsplus_btree_recptr (&data->catalog_tree, node, ptr);
label_len = grub_be_to_cpu16 (catkey->namelen);
+
+ /* Ensure that the length is >= 0. */
+ if (label_len < 0)
+ label_len = 0;
+
+ /* Ensure label length is at most 255 Unicode characters. */
+ if (label_len > 255)
+ label_len = 255;
+
label_name = grub_calloc (label_len, sizeof (*label_name));
if (!label_name)
{
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