From 321933f060896f721e361a1c8a8d3731bdcee827 Mon Sep 17 00:00:00 2001
From: Michael Schroeder <mls@suse.de>
Date: Wed, 22 Jun 2022 14:07:01 +0200
Subject: [PATCH] Fix short circuiting of version strings in expressions

We use an empty string when discarding a value due to short circuiting, but
an empty string is not allowed for versions. So use "0" in that case.

Fixes: #1883
---
 rpmio/expression.c | 2 +-
 tests/rpmmacro.at  | 2 ++
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/rpmio/expression.c b/rpmio/expression.c
index a389a04..98a44bb 100644
--- a/rpmio/expression.c
+++ b/rpmio/expression.c
@@ -477,7 +477,7 @@ static int rdToken(ParseState state)
       if (qtok == TOK_STRING) {
 	v = valueMakeString(temp);
       } else {
-	v = valueMakeVersion(temp);
+	v = valueMakeVersion(state->flags & RPMEXPR_DISCARD ? "0" : temp);
         free(temp); /* version doesn't take ownership of the string */
         if (v == 0) {
 	  exprErr(state, _("invalid version"), p+1);
diff --git a/tests/rpmmacro.at b/tests/rpmmacro.at
index d1490b4..c4376d4 100644
--- a/tests/rpmmacro.at
+++ b/tests/rpmmacro.at
@@ -533,6 +533,7 @@ runroot rpm \
     --eval '%["%{aaa}"]' \
     --eval '%[%{?ccc}]' \
     --eval '%[v"1:2.3-4"]' \
+    --eval '%[v"0" && v"0"]' \
 ]],
 [0],
 [4096
@@ -542,6 +543,7 @@ runroot rpm \
 5
 0
 1:2.3-4
+0
 ],
 [])
 AT_CLEANUP
-- 
1.8.3.1

