decoder_process: data_structure can be NULL

Check it before dereferencing.

Fixes #14530

Reviewed-by: Shane Lontis <shane.lontis@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/14531)

diff --git a/crypto/encode_decode/decoder_lib.c b/crypto/encode_decode/decoder_lib.c
index e928561b81b5e08068b061215494834f09e1498d..a644924aebc6f6e600a5cd036363a2a587f00092 100644 (file)
--- a/crypto/encode_decode/decoder_lib.c
+++ b/crypto/encode_decode/decoder_lib.c
@@ -608,7 +608,7 @@ static int decoder_process(const OSSL_PARAM params[], void *arg)
          * too special knowledge.
          */
         trace_data_structure = data_structure;
-        if (data_type != NULL
+        if (data_type != NULL && data_structure != NULL
             && strcasecmp(data_structure, "type-specific") == 0)
             data_structure = NULL;