re-align these copies of the a2i_*(3) code with f_string.c rev. 1.19

to fix the same double-counting of the backslash
and to make the parsing stricter in the same way;
OK tb@

1 files changed, 6 insertions, 14 deletions

diff --git a/src/lib/libcrypto/asn1/f_int.c b/src/lib/libcrypto/asn1/f_int.c
index d03fafe87d..8ce9d20d5f 100644
--- a/src/lib/libcrypto/asn1/f_int.c
+++ b/src/lib/libcrypto/asn1/f_int.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: f_int.c,v 1.20 2018/05/13 13:48:08 jsing Exp $ */
+/* $OpenBSD: f_int.c,v 1.21 2021/11/23 11:10:51 schwarze Exp $ */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -126,19 +126,12 @@ a2i_ASN1_INTEGER(BIO *bp, ASN1_INTEGER *bs, char *buf, int size)
                         buf[--i] = '\0';
                 if (i == 0)
                         goto err_sl;
-                again = (buf[i - 1] == '\\');
-
-                for (j = 0; j < i; j++) {
-                        if (!(((buf[j] >= '0') && (buf[j] <= '9')) ||
-                            ((buf[j] >= 'a') && (buf[j] <= 'f')) ||
-                            ((buf[j] >= 'A') && (buf[j] <= 'F')))) {
-                                i = j;
-                                break;
-                        }
-                }
+                if (buf[i - 1] == '\\') {
+                        i--;
+                        again = 1;
+                } else
+                        again = 0;
                 buf[i] = '\0';
-                /* We have now cleared all the crap off the end of the
-                 * line */
                 if (i < 2)
                         goto err_sl;
 
@@ -151,7 +144,6 @@ a2i_ASN1_INTEGER(BIO *bp, ASN1_INTEGER *bs, char *buf, int size)
                         }
                 }
                 k = 0;
-                i -= again;
                 if (i % 2 != 0) {
                         ASN1error(ASN1_R_ODD_NUMBER_OF_CHARS);
                         goto err;