From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 From: Darren Kenny 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 Reviewed-by: Daniel Kiper --- 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 e06bcbb9b..03a33ea24 100644 --- a/grub-core/fs/hfsplus.c +++ b/grub-core/fs/hfsplus.c @@ -1012,6 +1012,15 @@ 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) {