[Buildroot] [PATCH] package/lz4: add upstream security fix for CVE-2021-3520

[Yann E. MORIN]

Peter, All,

On 2021-05-23 11:52 +0200, Peter Korsgaard spake thusly:
> Fixes a potential memory corruption with negative memmove() size.  For
> details, see (NVD not yet updated):
> 
> https://security-tracker.debian.org/tracker/CVE-2021-3520
> 
> Signed-off-by: Peter Korsgaard <peter at korsgaard.com>

Applied to master, thanks.

Regards,
Yann E. MORIN.

> ---
>  ...mory-corruption-with-negative-memmov.patch | 26 +++++++++++++++++++
>  package/lz4/lz4.mk                            |  3 +++
>  2 files changed, 29 insertions(+)
>  create mode 100644 package/lz4/0001-Fix-potential-memory-corruption-with-negative-memmov.patch
> 
> diff --git a/package/lz4/0001-Fix-potential-memory-corruption-with-negative-memmov.patch b/package/lz4/0001-Fix-potential-memory-corruption-with-negative-memmov.patch
> new file mode 100644
> index 0000000000..57e4e38f84
> --- /dev/null
> +++ b/package/lz4/0001-Fix-potential-memory-corruption-with-negative-memmov.patch
> @@ -0,0 +1,26 @@
> +From 8301a21773ef61656225e264f4f06ae14462bca7 Mon Sep 17 00:00:00 2001
> +From: Jasper Lievisse Adriaanse <j at jasper.la>
> +Date: Fri, 26 Feb 2021 15:21:20 +0100
> +Subject: [PATCH] Fix potential memory corruption with negative memmove() size
> +
> +Signed-off-by: Peter Korsgaard <peter at korsgaard.com>
> +---
> + lib/lz4.c | 2 +-
> + 1 file changed, 1 insertion(+), 1 deletion(-)
> +
> +diff --git a/lib/lz4.c b/lib/lz4.c
> +index 5f524d0..c2f504e 100644
> +--- a/lib/lz4.c
> ++++ b/lib/lz4.c
> +@@ -1749,7 +1749,7 @@ LZ4_decompress_generic(
> +                  const size_t dictSize         /* note : = 0 if noDict */
> +                  )
> + {
> +-    if (src == NULL) { return -1; }
> ++    if ((src == NULL) || (outputSize < 0)) { return -1; }
> + 
> +     {   const BYTE* ip = (const BYTE*) src;
> +         const BYTE* const iend = ip + srcSize;
> +-- 
> +2.20.1
> +
> diff --git a/package/lz4/lz4.mk b/package/lz4/lz4.mk
> index e0236c05b1..9b9b6198c3 100644
> --- a/package/lz4/lz4.mk
> +++ b/package/lz4/lz4.mk
> @@ -17,6 +17,9 @@ LZ4_CPE_ID_VENDOR = yann_collet
>  # See https://github.com/lz4/lz4/issues/818
>  LZ4_IGNORE_CVES += CVE-2014-4715
>  
> +# 0001-Fix-potential-memory-corruption-with-negative-memmov.patch
> +LZ4_IGNORE_CVES += CVE-2021-3520
> +
>  ifeq ($(BR2_STATIC_LIBS),y)
>  LZ4_MAKE_OPTS += BUILD_SHARED=no
>  else ifeq ($(BR2_SHARED_LIBS),y)
> -- 
> 2.20.1
> 
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