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-rw-r--r--lib/lz4frame.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/lib/lz4frame.c b/lib/lz4frame.c
index ebd1089..488ab75 100644
--- a/lib/lz4frame.c
+++ b/lib/lz4frame.c
@@ -1631,7 +1631,8 @@ size_t LZ4F_decompress(LZ4F_dctx* dctx,
if (dctx->tmpOutSize > 64 KB) copySize = 0;
if (copySize > preserveSize) copySize = preserveSize;
- memcpy(dctx->tmpOutBuffer + preserveSize - copySize, oldDictEnd - copySize, copySize);
+ if (copySize > 0)
+ memcpy(dctx->tmpOutBuffer + preserveSize - copySize, oldDictEnd - copySize, copySize);
dctx->dict = dctx->tmpOutBuffer;
dctx->dictSize = preserveSize + dctx->tmpOutStart;
@@ -1639,7 +1640,8 @@ size_t LZ4F_decompress(LZ4F_dctx* dctx,
const BYTE* const oldDictEnd = dctx->dict + dctx->dictSize;
size_t const newDictSize = MIN(dctx->dictSize, 64 KB);
- memcpy(dctx->tmpOutBuffer, oldDictEnd - newDictSize, newDictSize);
+ if (newDictSize > 0)
+ memcpy(dctx->tmpOutBuffer, oldDictEnd - newDictSize, newDictSize);
dctx->dict = dctx->tmpOutBuffer;
dctx->dictSize = newDictSize;