From: Paul Eggert <eggert@cs.ucla.edu>
Date: Tue, 19 May 2020 18:52:01 +0000 (-0700)
Subject: tar: avoid read overrun
X-Git-Tag: release_1_33~10
X-Git-Url: http://git.ipfire.org/gitweb/gitweb.cgi?a=commitdiff_plain;h=dd1a6bd37a0d57eb4f002f01f49c51fa5c6bb104;p=thirdparty%2Ftar.git

tar: avoid read overrun

Problem reported by Timotej Kapus in:
https://lists.gnu.org/r/bug-tar/2020-05/msg00001.html
* src/transform.c (parse_transform_expr):
Diagnose ‘--transform='s'’ instead of continuing past '\0'.
---

diff --git a/src/transform.c b/src/transform.c
index 0a4972a5..dea2ecce 100644
--- a/src/transform.c
+++ b/src/transform.c
@@ -208,6 +208,8 @@ parse_transform_expr (const char *expr)
     }
 
   delim = expr[1];
+  if (!delim)
+    USAGE_ERROR ((0, 0, _("Invalid transform expression")));
 
   /* Scan regular expression */
   for (i = 2; expr[i] && expr[i] != delim; i++)