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lib: zstd: fix null-deref in ZSTD_createCDict_advanced2()

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ZSTD_createCDict_advanced2() must ensure that
ZSTD_createCDict_advanced_internal() has successfully allocated cdict. 
customMalloc() may be called under low memory condition and may be unable
to allocate workspace for cdict.

Link: https://lkml.kernel.org/r/20240902105656.1383858-4-senozhatsky@chromium.org
Signed-off-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Nick Terrell <terrelln@fb.com>
Cc: Minchan Kim <minchan@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Sergey Senozhatsky 2024-09-02 19:55:51 +09:00 committed by Andrew Morton
parent 7518847430
commit f3c11cf5ca
1 changed files with 2 additions and 0 deletions
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2
lib/zstd/compress/zstd_compress.c
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@ -4810,6 +4810,8 @@ ZSTD_CDict* ZSTD_createCDict_advanced2(
dictLoadMethod, cctxParams.cParams,
cctxParams.useRowMatchFinder, cctxParams.enableDedicatedDictSearch,
customMem);
if (!cdict)
return NULL;
if (ZSTD_isError( ZSTD_initCDict_internal(cdict,
dict, dictSize,