43 lines
1.3 KiB
Diff
Executable File
43 lines
1.3 KiB
Diff
Executable File
From 26d06cef6684055a30cce5922095d22e8a9a91e3 Mon Sep 17 00:00:00 2001
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From: leizhongkai <leizhongkai@huawei.com>
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Date: Sat, 17 Apr 2021 14:27:23 +0800
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Subject: [PATCH] busybox: fix CVE-2021-28831
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backoprt from upstream:
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https://git.busybox.net/busybox/patch/?id=dbd3b883a891f076911d752f56f7a906d5650a17
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Signed-off-by: leizhongkai <leizhongkai@huawei.com>
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---
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archival/libarchive/decompress_gunzip.c | 11 +++++++++++
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1 file changed, 11 insertions(+)
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diff --git a/archival/libarchive/decompress_gunzip.c b/archival/libarchive/decompress_gunzip.c
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index 7f9046b..3eeae76 100644
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--- a/archival/libarchive/decompress_gunzip.c
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+++ b/archival/libarchive/decompress_gunzip.c
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@@ -222,10 +222,21 @@ static const uint8_t border[] ALIGN1 = {
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* each table.
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* t: table to free
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*/
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+#define BAD_HUFT(p) ((uintptr_t)(p) & 1)
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+#define ERR_RET ((huft_t*)(uintptr_t)1)
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static void huft_free(huft_t *p)
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{
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huft_t *q;
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+ /*
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+ * If 'p' has the error bit set we have to clear it, otherwise we might run
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+ * into a segmentation fault or an invalid pointer to free(p)
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+ */
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+ if (BAD_HUFT(p)) {
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+ p = (huft_t*)((uintptr_t)(p) ^ (uintptr_t)(ERR_RET));
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+ }
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+
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+
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/* Go through linked list, freeing from the malloced (t[-1]) address. */
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while (p) {
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q = (--p)->v.t;
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--
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2.23.0
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