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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Daniel Axtens <dja@axtens.net>
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Date: Thu, 21 Jan 2021 12:22:28 +1100
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Subject: [PATCH] io/gzio: Zero gzio->tl/td in init_dynamic_block() if
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huft_build() fails
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If huft_build() fails, gzio->tl or gzio->td could contain pointers that
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are no longer valid. Zero them out.
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This prevents a double free when grub_gzio_close() comes through and
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attempts to free them again.
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Signed-off-by: Daniel Axtens <dja@axtens.net>
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Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
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---
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grub-core/io/gzio.c | 2 ++
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1 file changed, 2 insertions(+)
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diff --git a/grub-core/io/gzio.c b/grub-core/io/gzio.c
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index fa7d9990b84..81d658818be 100644
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--- a/grub-core/io/gzio.c
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+++ b/grub-core/io/gzio.c
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@@ -1010,6 +1010,7 @@ init_dynamic_block (grub_gzio_t gzio)
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gzio->bl = lbits;
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if (huft_build (ll, nl, 257, cplens, cplext, &gzio->tl, &gzio->bl) != 0)
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{
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+ gzio->tl = 0;
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grub_error (GRUB_ERR_BAD_COMPRESSED_DATA,
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"failed in building a Huffman code table");
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return;
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@@ -1019,6 +1020,7 @@ init_dynamic_block (grub_gzio_t gzio)
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{
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huft_free (gzio->tl);
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gzio->tl = 0;
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+ gzio->td = 0;
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grub_error (GRUB_ERR_BAD_COMPRESSED_DATA,
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"failed in building a Huffman code table");
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return;
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