Check for invalid NULL pointer inputs to zlib operations.

1 files changed, 4 insertions, 0 deletions

diff --git a/uncompr.c b/uncompr.c
index 8f7438ee..14ef96ce 100644
--- a/uncompr.c
+++ b/uncompr.c
@@ -33,6 +33,10 @@ int ZEXPORT uncompress2_z(Bytef *dest, z_size_t *destLen, const Bytef *source,
     const uInt max = (uInt)-1;
     z_size_t len, left;
 
+    if (sourceLen == NULL || (*sourceLen > 0 && source == NULL) ||
+        destLen == NULL || (*destLen > 0 && dest == NULL))
+        return Z_STREAM_ERROR;
+
     len = *sourceLen;
     left = *destLen;
     if (left == 0 && dest == Z_NULL)