From 8301a21773ef61656225e264f4f06ae14462bca7 Mon Sep 17 00:00:00 2001
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From: Jasper Lievisse Adriaanse <j@jasper.la>
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Date: Fri, 26 Feb 2021 15:21:20 +0100
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Subject: [PATCH] Fix potential memory corruption with negative memmove() size
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Upstream-Status: Backport
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https://github.com/lz4/lz4/commit/8301a21773ef61656225e264f4f06ae14462bca7#diff-7055e9cf14c488aea9837aaf9f528b58ee3c22988d7d0d81d172ec62d94a88a7
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CVE: CVE-2021-3520
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Signed-off-by: Armin Kuster <akuster@mvista.com>
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---
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lib/lz4.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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Index: git/lib/lz4.c
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===================================================================
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--- git.orig/lib/lz4.c
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+++ git/lib/lz4.c
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@@ -1665,7 +1665,7 @@ LZ4_decompress_generic(
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const size_t dictSize /* note : = 0 if noDict */
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)
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{
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- if (src == NULL) { return -1; }
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+ if ((src == NULL) || (outputSize < 0)) { return -1; }
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{ const BYTE* ip = (const BYTE*) src;
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const BYTE* const iend = ip + srcSize;
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