fix error found by coverity: check if ctx is != NULL before calling BN_CTX_end()

diff --git a/crypto/ec/ec_mult.c b/crypto/ec/ec_mult.c
index 7320e31c5c7c352773a2e650e23bd4f2cc24792f..a045139a0015099360a06b67af6eb142d9ae1498 100644 (file)
--- a/crypto/ec/ec_mult.c
+++ b/crypto/ec/ec_mult.c
@@ -879,7 +879,8 @@ int ec_wNAF_precompute_mult(EC_GROUP *group, BN_CTX *ctx)
 
        ret = 1;
  err:
-       BN_CTX_end(ctx);
+       if (ctx != NULL)
+               BN_CTX_end(ctx);
        if (new_ctx != NULL)
                BN_CTX_free(new_ctx);
        if (pre_comp)