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