From: Paul Eggert <eggert@cs.ucla.edu>
Date: Sat, 2 Nov 2024 06:18:30 +0000 (-0700)
Subject: Avoid unlikely verbose_option overflow
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=6993486ed8f14992cc228021b7e96a7a576e827c;p=thirdparty%2Ftar.git

Avoid unlikely verbose_option overflow

* src/tar.c (parse_opt, decode_options):
Avoid undefined behavior if verbose_option overflows.
---

diff --git a/src/tar.c b/src/tar.c
index 3a4421e9..66486fcf 100644
--- a/src/tar.c
+++ b/src/tar.c
@@ -1797,7 +1797,7 @@ parse_opt (int key, char *arg, struct argp_state *state)
 
     case 't':
       set_subcommand_option (LIST_SUBCOMMAND);
-      verbose_option++;
+      verbose_option += verbose_option <= 2;
       break;
 
     case TEST_LABEL_OPTION:
@@ -1825,7 +1825,7 @@ parse_opt (int key, char *arg, struct argp_state *state)
       break;
 
     case 'v':
-      verbose_option++;
+      verbose_option += verbose_option <= 2;
       warning_option |= WARN_VERBOSE_WARNINGS;
       break;
 
@@ -2710,7 +2710,7 @@ decode_options (int argc, char **argv)
       /* --test-label is silent if the user has specified the label name to
 	 compare against. */
       if (!name_more_files ())
-	verbose_option++;
+	verbose_option += verbose_option <= 2;
     }
   else if (utc_option)
     verbose_option = 2;