Submitted by: Victor B. Wagner <vitus@cryptocom.ru>

Reviewed by: steve@openssl.org

Check return codes properly in md BIO and dgst command.

apps/dgst.c

@@ -551,7 +551,7 @@ int do_fp(BIO *out, unsigned char *buf, BIO *bp, int sep, int binout,
 	  const char *sig_name, const char *md_name,
 	  const char *file,BIO *bmd)
 	{
-	size_t len;
+	ssize_t len;
 	int i;
 
 	for (;;)
@@ -598,7 +598,14 @@ int do_fp(BIO *out, unsigned char *buf, BIO *bp, int sep, int binout,
 			}
 		}
 	else
+		{
 		len=BIO_gets(bp,(char *)buf,BUFSIZE);
+		if (len <0) 
+			{
+			ERR_print_errors(bio_err);
+			return 1;
+			}
+		}
 
 	if(binout) BIO_write(out, buf, len);
 	else 

crypto/evp/bio_md.c

@@ -130,8 +130,8 @@ static int md_read(BIO *b, char *out, int outl)
 		{
 		if (ret > 0)
 			{
-			EVP_DigestUpdate(ctx,(unsigned char *)out,
-				(unsigned int)ret);
+			if (EVP_DigestUpdate(ctx,(unsigned char *)out,
+				(unsigned int)ret)<=0) return (-1);
 			}
 		}
 	BIO_clear_retry_flags(b);
@@ -253,7 +253,9 @@ static int md_gets(BIO *bp, char *buf, int size)
 	ctx=bp->ptr;
 	if (size < ctx->digest->md_size)
 		return(0);
-	EVP_DigestFinal_ex(ctx,(unsigned char *)buf,&ret);
+	if (EVP_DigestFinal_ex(ctx,(unsigned char *)buf,&ret)<=0) 
+		return -1;
+		
 	return((int)ret);
 	}