From: Eugene Syromiatnikov <esyr@openssl.org>
Date: Thu, 14 Aug 2025 17:15:09 +0000 (+0200)
Subject: crypto/bio/bio_print.c: reset max to zero if empty precision string is provided
X-Git-Tag: openssl-3.6.0-alpha1~37
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=cbb0a561e64b25001039f0ac82170536b2ef4893;p=thirdparty%2Fopenssl.git

crypto/bio/bio_print.c: reset max to zero if empty precision string is provided

Per [1]:

    a null digit string is treated as zero.

[1] https://pubs.opengroup.org/onlinepubs/9699919799/functions/printf.html

Signed-off-by: Eugene Syromiatnikov <esyr@openssl.org>

Reviewed-by: Saša Nedvědický <sashan@openssl.org>
Reviewed-by: Neil Horman <nhorman@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/28177)
---

diff --git a/crypto/bio/bio_print.c b/crypto/bio/bio_print.c
index f8031743ac1..3cb4d285574 100644
--- a/crypto/bio/bio_print.c
+++ b/crypto/bio/bio_print.c
@@ -182,8 +182,11 @@ _dopr(char **sbuffer,
                 max = va_arg(args, int);
                 ch = *format++;
                 state = DP_S_MOD;
-            } else
+            } else {
+                if (max < 0)
+                    max = 0;
                 state = DP_S_MOD;
+            }
             break;
         case DP_S_MOD:
             switch (ch) {