From 030a063371f4f4fd0d4366ebd3cebfa9930773da Mon Sep 17 00:00:00 2001
From: Martin Pitt <martin.pitt@ubuntu.com>
Date: Wed, 22 Apr 2015 23:09:43 +0100
Subject: [PATCH] util: Fix assertion in split() on missing '

When parsing a unit with a trailing slash after an escaped line break, like

  ExecStart=/bin/echo 'foo \
    bar'

the split() function (through config_parse()) asserted and crashed pid 1:

  Assertion 'current[*l + 1] == quotechars[0]' failed at ../src/shared/util.c:583, function split(). Aborting.

Fix this by returning an error in this case ("trailing garbage").

Add corresponding test case. Also fix the missing "unit" argument of
config_parse_exec() in the comment.

https://launchpad.net/bugs/1447243
(cherry picked from commit 470dca63cd2b1579f45f72b6b9777494abeff105)

Cherry-picked from: 8f93633
Resolves: #1222517
---
 src/shared/util.c         |  3 +--
 src/test/test-unit-file.c | 15 +++++++++++++++
 2 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/src/shared/util.c b/src/shared/util.c
index 1e1bf94..649344d 100644
--- a/src/shared/util.c
+++ b/src/shared/util.c
@@ -571,13 +571,12 @@ const char* split(const char **state, size_t *l, const char *separator, bool quo
                 char quotechars[2] = {*current, '\0'};
 
                 *l = strcspn_escaped(current + 1, quotechars);
-                if (current[*l + 1] == '\0' ||
+                if (current[*l + 1] == '\0' || current[*l + 1] != quotechars[0] ||
                     (current[*l + 2] && !strchr(separator, current[*l + 2]))) {
                         /* right quote missing or garbage at the end */
                         *state = current;
                         return NULL;
                 }
-                assert(current[*l + 1] == quotechars[0]);
                 *state = current++ + *l + 2;
         } else if (quoted) {
                 *l = strcspn_escaped(current, separator);
diff --git a/src/test/test-unit-file.c b/src/test/test-unit-file.c
index e517f57..9f3e3a2 100644
--- a/src/test/test-unit-file.c
+++ b/src/test/test-unit-file.c
@@ -92,6 +92,7 @@ static void check_execcommand(ExecCommand *c,
 
 static void test_config_parse_exec(void) {
         /* int config_parse_exec(
+                 const char *unit,
                  const char *filename,
                  unsigned line,
                  const char *section,
@@ -303,6 +304,20 @@ static void test_config_parse_exec(void) {
         assert_se(r == 0);
         assert_se(c1->command_next == NULL);
 
+        log_info("/* missing ending ' */");
+        r = config_parse_exec(NULL, "fake", 4, "section", 1,
+                              "LValue", 0, "/path 'foo",
+                              &c, NULL);
+        assert_se(r == 0);
+        assert_se(c1->command_next == NULL);
+
+        log_info("/* missing ending ' with trailing backslash */");
+        r = config_parse_exec(NULL, "fake", 4, "section", 1,
+                              "LValue", 0, "/path 'foo\\",
+                              &c, NULL);
+        assert_se(r == 0);
+        assert_se(c1->command_next == NULL);
+
         exec_command_free_list(c);
 }