lz4: fix CVE-2025-62813

Prevent attackers to cause a denial of service (application crash) or
possibly have unspecified other impact when the application processes
untrusted LZ4 frames. For example, LZ4F_createCDict_advanced in
lib/lz4frame.c mishandles NULL checks.

Reference:
https://nvd.nist.gov/vuln/detail/CVE-2025-62813

Upstream patch:
f64efec011

(From OE-Core rev: 0a63e3e120cc6958e2963a3ad510ec7c03f1adae)

Signed-off-by: David Nyström <david.nystrom@est.tech>
Signed-off-by: Steve Sakoman <steve@sakoman.com>

meta/recipes-support/lz4/files/CVE-2025-62813.patch

@@ -0,0 +1,73 @@
+From 10dbd089b74cf858a24a4aa4c2a438984ddf17d7 Mon Sep 17 00:00:00 2001
+From: louislafosse <louis.lafosse@epitech.eu>
+Date: Mon, 31 Mar 2025 20:48:52 +0200
+Subject: [PATCH] fix(null) : improve error handlings when passing a null
+ pointer to some functions from lz4frame
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Upstream-Status: Backport [Upstream commit https://github.com/lz4/lz4/commit/f64efec011c058bd70348576438abac222fe6c82]
+CVE: CVE-2025-62813
+
+Signed-off-by: David Nyström <david.nystrom@est.tech>
+---
+ lib/lz4frame.c    | 15 +++++++++++++--
+ tests/frametest.c |  9 ++++++---
+ 2 files changed, 19 insertions(+), 5 deletions(-)
+
+diff --git a/lib/lz4frame.c b/lib/lz4frame.c
+index 174f9ae4..cc6ed6f1 100644
+--- a/lib/lz4frame.c
++++ b/lib/lz4frame.c
+@@ -530,9 +530,16 @@ LZ4F_CDict*
+ LZ4F_createCDict_advanced(LZ4F_CustomMem cmem, const void* dictBuffer, size_t dictSize)
+ {
+     const char* dictStart = (const char*)dictBuffer;
+-    LZ4F_CDict* const cdict = (LZ4F_CDict*)LZ4F_malloc(sizeof(*cdict), cmem);
++    LZ4F_CDict* cdict = NULL;
++
+     DEBUGLOG(4, "LZ4F_createCDict_advanced");
+-    if (!cdict) return NULL;
++
++    if (!dictStart)
++        return NULL;
++    cdict = (LZ4F_CDict*)LZ4F_malloc(sizeof(*cdict), cmem);
++    if (!cdict)
++        return NULL;
++
+     cdict->cmem = cmem;
+     if (dictSize > 64 KB) {
+         dictStart += dictSize - 64 KB;
+@@ -1429,6 +1436,10 @@ LZ4F_errorCode_t LZ4F_getFrameInfo(LZ4F_dctx* dctx,
+                                    LZ4F_frameInfo_t* frameInfoPtr,
+                              const void* srcBuffer, size_t* srcSizePtr)
+ {
++    assert(dctx != NULL);
++    RETURN_ERROR_IF(frameInfoPtr == NULL, parameter_null);
++    RETURN_ERROR_IF(srcSizePtr == NULL, parameter_null);
++
+     LZ4F_STATIC_ASSERT(dstage_getFrameHeader < dstage_storeFrameHeader);
+     if (dctx->dStage > dstage_storeFrameHeader) {
+         /* frameInfo already decoded */
+diff --git a/tests/frametest.c b/tests/frametest.c
+index 33019551..523e35d1 100644
+--- a/tests/frametest.c
++++ b/tests/frametest.c
+@@ -589,10 +589,13 @@ int basicTests(U32 seed, double compressibility)
+         size_t const srcSize = 65 KB; /* must be > 64 KB to avoid short-size optimizations */
+         size_t const dstCapacity = LZ4F_compressFrameBound(srcSize, NULL);
+         size_t cSizeNoDict, cSizeWithDict;
+-        LZ4F_CDict* const cdict = LZ4F_createCDict(CNBuffer, dictSize);
+-        if (cdict == NULL) goto _output_error;
+-        CHECK( LZ4F_createCompressionContext(&cctx, LZ4F_VERSION) );
++        LZ4F_CDict* cdict = NULL;
+ 
++        CHECK( LZ4F_createCompressionContext(&cctx, LZ4F_VERSION) );
++        cdict = LZ4F_createCDict(CNBuffer, dictSize);
++        if (cdict == NULL)
++            goto _output_error;
++        
+         DISPLAYLEVEL(3, "Testing LZ4F_createCDict_advanced : ");
+         {   LZ4F_CDict* const cda = LZ4F_createCDict_advanced(lz4f_cmem_test, CNBuffer, dictSize);
+             if (cda == NULL) goto _output_error;

meta/recipes-support/lz4/lz4_1.9.4.bb

@@ -13,8 +13,9 @@ PE = "1"
 SRCREV = "5ff839680134437dbf4678f3d0c7b371d84f4964"
 
 SRC_URI = "git://github.com/lz4/lz4.git;branch=release;protocol=https \
-	   file://run-ptest \
-	   "
+           file://run-ptest \
+           file://CVE-2025-62813.patch \
+           "
 UPSTREAM_CHECK_GITTAGREGEX = "v(?P<pver>.*)"
 
 S = "${WORKDIR}/git"