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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Darren Kenny <darren.kenny@oracle.com>
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Date: Fri, 23 Oct 2020 17:09:31 +0000
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Subject: [PATCH] hfsplus: Check that the volume name length is valid
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HFS+ documentation suggests that the maximum filename and volume name is
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255 Unicode characters in length.
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So, when converting from big-endian to little-endian, we should ensure
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that the name of the volume has a length that is between 0 and 255,
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inclusive.
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Fixes: CID 73641
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Signed-off-by: Darren Kenny <darren.kenny@oracle.com>
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Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
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---
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grub-core/fs/hfsplus.c | 9 +++++++++
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1 file changed, 9 insertions(+)
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diff --git a/grub-core/fs/hfsplus.c b/grub-core/fs/hfsplus.c
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index e06bcbb9ba3..03a33ea2477 100644
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--- a/grub-core/fs/hfsplus.c
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+++ b/grub-core/fs/hfsplus.c
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@@ -1012,6 +1012,15 @@ grub_hfsplus_label (grub_device_t device, char **label)
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grub_hfsplus_btree_recptr (&data->catalog_tree, node, ptr);
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label_len = grub_be_to_cpu16 (catkey->namelen);
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+
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+ /* Ensure that the length is >= 0. */
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+ if (label_len < 0)
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+ label_len = 0;
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+
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+ /* Ensure label length is at most 255 Unicode characters. */
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+ if (label_len > 255)
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+ label_len = 255;
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+
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label_name = grub_calloc (label_len, sizeof (*label_name));
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if (!label_name)
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{
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