1 files changed, 12 insertions, 5 deletions

diff --git a/src/lib/libcrypto/asn1/a_strex.c b/src/lib/libcrypto/asn1/a_strex.c
index 7fc14d3296..264ebf2393 100644
--- a/src/lib/libcrypto/asn1/a_strex.c
+++ b/src/lib/libcrypto/asn1/a_strex.c
@@ -74,6 +74,11 @@
 
 #define CHARTYPE_BS_ESC         (ASN1_STRFLGS_ESC_2253 | CHARTYPE_FIRST_ESC_2253 | CHARTYPE_LAST_ESC_2253)
 
+#define ESC_FLAGS (ASN1_STRFLGS_ESC_2253 | \
+                  ASN1_STRFLGS_ESC_QUOTE | \
+                  ASN1_STRFLGS_ESC_CTRL | \
+                  ASN1_STRFLGS_ESC_MSB)
+
 
 /* Three IO functions for sending data to memory, a BIO and
  * and a FILE pointer.
@@ -148,6 +153,13 @@ static int do_esc_char(unsigned long c, unsigned char flags, char *do_quotes, ch
                 if(!io_ch(arg, tmphex, 3)) return -1;
                 return 3;
         }
+        /* If we get this far and do any escaping at all must escape 
+         * the escape character itself: backslash.
+         */
+        if (chtmp == '\\' && flags & ESC_FLAGS) {
+                if(!io_ch(arg, "\\\\", 2)) return -1;
+                return 2;
+        }
         if(!io_ch(arg, &chtmp, 1)) return -1;
         return 1;
 }
@@ -292,11 +304,6 @@ static const signed char tag2nbyte[] = {
         4, -1, 2                /* 28-30 */
 };
 
-#define ESC_FLAGS (ASN1_STRFLGS_ESC_2253 | \
-                  ASN1_STRFLGS_ESC_QUOTE | \
-                  ASN1_STRFLGS_ESC_CTRL | \
-                  ASN1_STRFLGS_ESC_MSB)
-
 /* This is the main function, print out an
  * ASN1_STRING taking note of various escape
  * and display options. Returns number of