Check return value of strdup() in libpq connection option parsing.

An out-of-memory in most of these would lead to strange behavior, like
connecting to a different database than intended, but some would lead to
an outright segfault.

Alex Shulgin and me. Backpatch to all supported versions.

diff --git a/src/interfaces/libpq/fe-connect.c b/src/interfaces/libpq/fe-connect.c
index 1a3a6b237a3f4497cfeef1f7837295a0a417a65b..d522a9c12d1be06361948511b674b042863a6c41 100644 (file)
--- a/src/interfaces/libpq/fe-connect.c
+++ b/src/interfaces/libpq/fe-connect.c
@@ -286,7 +286,7 @@ static int  connectDBStart(PGconn *conn);
 static int connectDBComplete(PGconn *conn);
 static PGPing internal_ping(PGconn *conn);
 static PGconn *makeEmptyPGconn(void);
-static void fillPGconn(PGconn *conn, PQconninfoOption *connOptions);
+static bool fillPGconn(PGconn *conn, PQconninfoOption *connOptions);
 static void freePGconn(PGconn *conn);
 static void closePGconn(PGconn *conn);
 static PQconninfoOption *conninfo_parse(const char *conninfo,
@@ -494,7 +494,11 @@ PQconnectStartParams(const char **keywords,
    /*
     * Move option values into conn structure
     */
-   fillPGconn(conn, connOptions);
+   if (!fillPGconn(conn, connOptions))
+   {
+       PQconninfoFree(connOptions);
+       return conn;
+   }
 
    /*
     * Free the option info - all is in conn now
@@ -574,7 +578,29 @@ PQconnectStart(const char *conninfo)
    return conn;
 }
 
-static void
+/*
+ * Move option values into conn structure
+ *
+ * Don't put anything cute here --- intelligence should be in
+ * connectOptions2 ...
+ *
+ * Returns true on success. On failure, returns false and sets error message.
+ */
+#define FILL_CONN_OPTION(dst, name) \
+   do \
+   { \
+       tmp = conninfo_getval(connOptions, name); \
+       if (tmp) \
+       { \
+           dst = strdup(tmp); \
+           if (dst == NULL) \
+               goto oom_error; \
+       } \
+       else \
+           dst = NULL; \
+   } while(0)
+
+static bool
 fillPGconn(PGconn *conn, PQconninfoOption *connOptions)
 {
    char       *tmp;
@@ -587,48 +613,27 @@ fillPGconn(PGconn *conn, PQconninfoOption *connOptions)
     *
     * XXX: probably worth checking strdup() return value here...
     */
-   tmp = conninfo_getval(connOptions, "hostaddr");
-   conn->pghostaddr = tmp ? strdup(tmp) : NULL;
-   tmp = conninfo_getval(connOptions, "host");
-   conn->pghost = tmp ? strdup(tmp) : NULL;
-   tmp = conninfo_getval(connOptions, "port");
-   conn->pgport = tmp ? strdup(tmp) : NULL;
-   tmp = conninfo_getval(connOptions, "tty");
-   conn->pgtty = tmp ? strdup(tmp) : NULL;
-   tmp = conninfo_getval(connOptions, "options");
-   conn->pgoptions = tmp ? strdup(tmp) : NULL;
-   tmp = conninfo_getval(connOptions, "application_name");
-   conn->appname = tmp ? strdup(tmp) : NULL;
-   tmp = conninfo_getval(connOptions, "fallback_application_name");
-   conn->fbappname = tmp ? strdup(tmp) : NULL;
-   tmp = conninfo_getval(connOptions, "dbname");
-   conn->dbName = tmp ? strdup(tmp) : NULL;
-   tmp = conninfo_getval(connOptions, "user");
-   conn->pguser = tmp ? strdup(tmp) : NULL;
-   tmp = conninfo_getval(connOptions, "password");
-   conn->pgpass = tmp ? strdup(tmp) : NULL;
-   tmp = conninfo_getval(connOptions, "connect_timeout");
-   conn->connect_timeout = tmp ? strdup(tmp) : NULL;
-   tmp = conninfo_getval(connOptions, "client_encoding");
-   conn->client_encoding_initial = tmp ? strdup(tmp) : NULL;
-   tmp = conninfo_getval(connOptions, "keepalives");
-   conn->keepalives = tmp ? strdup(tmp) : NULL;
-   tmp = conninfo_getval(connOptions, "keepalives_idle");
-   conn->keepalives_idle = tmp ? strdup(tmp) : NULL;
-   tmp = conninfo_getval(connOptions, "keepalives_interval");
-   conn->keepalives_interval = tmp ? strdup(tmp) : NULL;
-   tmp = conninfo_getval(connOptions, "keepalives_count");
-   conn->keepalives_count = tmp ? strdup(tmp) : NULL;
-   tmp = conninfo_getval(connOptions, "sslmode");
-   conn->sslmode = tmp ? strdup(tmp) : NULL;
-   tmp = conninfo_getval(connOptions, "sslkey");
-   conn->sslkey = tmp ? strdup(tmp) : NULL;
-   tmp = conninfo_getval(connOptions, "sslcert");
-   conn->sslcert = tmp ? strdup(tmp) : NULL;
-   tmp = conninfo_getval(connOptions, "sslrootcert");
-   conn->sslrootcert = tmp ? strdup(tmp) : NULL;
-   tmp = conninfo_getval(connOptions, "sslcrl");
-   conn->sslcrl = tmp ? strdup(tmp) : NULL;
+   FILL_CONN_OPTION(conn->pghostaddr, "hostaddr");
+   FILL_CONN_OPTION(conn->pghost, "host");
+   FILL_CONN_OPTION(conn->pgport, "port");
+   FILL_CONN_OPTION(conn->pgtty, "tty");
+   FILL_CONN_OPTION(conn->pgoptions, "options");
+   FILL_CONN_OPTION(conn->appname, "application_name");
+   FILL_CONN_OPTION(conn->fbappname, "fallback_application_name");
+   FILL_CONN_OPTION(conn->dbName, "dbname");
+   FILL_CONN_OPTION(conn->pguser, "user");
+   FILL_CONN_OPTION(conn->pgpass, "password");
+   FILL_CONN_OPTION(conn->connect_timeout, "connect_timeout");
+   FILL_CONN_OPTION(conn->client_encoding_initial, "client_encoding");
+   FILL_CONN_OPTION(conn->keepalives, "keepalives");
+   FILL_CONN_OPTION(conn->keepalives_idle, "keepalives_idle");
+   FILL_CONN_OPTION(conn->keepalives_interval, "keepalives_interval");
+   FILL_CONN_OPTION(conn->keepalives_count, "keepalives_count");
+   FILL_CONN_OPTION(conn->sslmode, "sslmode");
+   FILL_CONN_OPTION(conn->sslkey, "sslkey");
+   FILL_CONN_OPTION(conn->sslcert, "sslcert");
+   FILL_CONN_OPTION(conn->sslrootcert, "sslrootcert");
+   FILL_CONN_OPTION(conn->sslcrl, "sslcrl");
 #ifdef USE_SSL
    tmp = conninfo_getval(connOptions, "requiressl");
    if (tmp && tmp[0] == '1')
@@ -637,20 +642,25 @@ fillPGconn(PGconn *conn, PQconninfoOption *connOptions)
        if (conn->sslmode)
            free(conn->sslmode);
        conn->sslmode = strdup("require");
+       if (!conn->sslmode)
+           return false;
    }
 #endif
-   tmp = conninfo_getval(connOptions, "requirepeer");
-   conn->requirepeer = tmp ? strdup(tmp) : NULL;
+   FILL_CONN_OPTION(conn->requirepeer, "requirepeer");
 #if defined(KRB5) || defined(ENABLE_GSS) || defined(ENABLE_SSPI)
-   tmp = conninfo_getval(connOptions, "krbsrvname");
-   conn->krbsrvname = tmp ? strdup(tmp) : NULL;
+   FILL_CONN_OPTION(conn->krbsrvname, "krbsrvname");
 #endif
 #if defined(ENABLE_GSS) && defined(ENABLE_SSPI)
-   tmp = conninfo_getval(connOptions, "gsslib");
-   conn->gsslib = tmp ? strdup(tmp) : NULL;
+   FILL_CONN_OPTION(conn->gsslib, "gsslib");
 #endif
-   tmp = conninfo_getval(connOptions, "replication");
-   conn->replication = tmp ? strdup(tmp) : NULL;
+   FILL_CONN_OPTION(conn->replication, "replication");
+
+   return true;
+
+oom_error:
+   printfPQExpBuffer(&conn->errorMessage,
+                     libpq_gettext("out of memory\n"));
+   return false;
 }
 
 /*
@@ -683,7 +693,12 @@ connectOptions1(PGconn *conn, const char *conninfo)
    /*
     * Move option values into conn structure
     */
-   fillPGconn(conn, connOptions);
+   if (!fillPGconn(conn, connOptions))
+   {
+       conn->status = CONNECTION_BAD;
+       PQconninfoFree(connOptions);
+       return false;
+   }
 
    /*
     * Free the option info - all is in conn now
@@ -713,6 +728,8 @@ connectOptions2(PGconn *conn)
        if (conn->dbName)
            free(conn->dbName);
        conn->dbName = strdup(conn->pguser);
+       if (!conn->dbName)
+           goto oom_error;
    }
 
    /*
@@ -725,7 +742,12 @@ connectOptions2(PGconn *conn)
        conn->pgpass = PasswordFromFile(conn->pghost, conn->pgport,
                                        conn->dbName, conn->pguser);
        if (conn->pgpass == NULL)
+       {
            conn->pgpass = strdup(DefaultPassword);
+           if (!conn->pgpass)
+               goto oom_error;
+
+       }
        else
            conn->dot_pgpass_used = true;
    }
@@ -783,7 +805,11 @@ connectOptions2(PGconn *conn)
 #endif
    }
    else
+   {
        conn->sslmode = strdup(DefaultSSLMode);
+       if (!conn->sslmode)
+           goto oom_error;
+   }
 
    /*
     * Resolve special "auto" client_encoding from the locale
@@ -793,6 +819,8 @@ connectOptions2(PGconn *conn)
    {
        free(conn->client_encoding_initial);
        conn->client_encoding_initial = strdup(pg_encoding_to_char(pg_get_encoding_from_locale(NULL, true)));
+       if (!conn->client_encoding_initial)
+           goto oom_error;
    }
 
    /*
@@ -803,6 +831,12 @@ connectOptions2(PGconn *conn)
    conn->options_valid = true;
 
    return true;
+
+oom_error:
+   conn->status = CONNECTION_BAD;
+   printfPQExpBuffer(&conn->errorMessage,
+                     libpq_gettext("out of memory\n"));
+   return false;
 }
 
 /*
@@ -885,6 +919,8 @@ PQsetdbLogin(const char *pghost, const char *pgport, const char *pgoptions,
            if (conn->dbName)
                free(conn->dbName);
            conn->dbName = strdup(dbName);
+           if (!conn->dbName)
+               goto oom_error;
        }
    }
 
@@ -897,6 +933,8 @@ PQsetdbLogin(const char *pghost, const char *pgport, const char *pgoptions,
        if (conn->pghost)
            free(conn->pghost);
        conn->pghost = strdup(pghost);
+       if (!conn->pghost)
+           goto oom_error;
    }
 
    if (pgport && pgport[0] != '\0')
@@ -904,6 +942,8 @@ PQsetdbLogin(const char *pghost, const char *pgport, const char *pgoptions,
        if (conn->pgport)
            free(conn->pgport);
        conn->pgport = strdup(pgport);
+       if (!conn->pgport)
+           goto oom_error;
    }
 
    if (pgoptions && pgoptions[0] != '\0')
@@ -911,6 +951,8 @@ PQsetdbLogin(const char *pghost, const char *pgport, const char *pgoptions,
        if (conn->pgoptions)
            free(conn->pgoptions);
        conn->pgoptions = strdup(pgoptions);
+       if (!conn->pgoptions)
+           goto oom_error;
    }
 
    if (pgtty && pgtty[0] != '\0')
@@ -918,6 +960,8 @@ PQsetdbLogin(const char *pghost, const char *pgport, const char *pgoptions,
        if (conn->pgtty)
            free(conn->pgtty);
        conn->pgtty = strdup(pgtty);
+       if (!conn->pgtty)
+           goto oom_error;
    }
 
    if (login && login[0] != '\0')
@@ -925,6 +969,8 @@ PQsetdbLogin(const char *pghost, const char *pgport, const char *pgoptions,
        if (conn->pguser)
            free(conn->pguser);
        conn->pguser = strdup(login);
+       if (!conn->pguser)
+           goto oom_error;
    }
 
    if (pwd && pwd[0] != '\0')
@@ -932,6 +978,8 @@ PQsetdbLogin(const char *pghost, const char *pgport, const char *pgoptions,
        if (conn->pgpass)
            free(conn->pgpass);
        conn->pgpass = strdup(pwd);
+       if (!conn->pgpass)
+           goto oom_error;
    }
 
    /*
@@ -947,6 +995,12 @@ PQsetdbLogin(const char *pghost, const char *pgport, const char *pgoptions,
        (void) connectDBComplete(conn);
 
    return conn;
+
+oom_error:
+   conn->status = CONNECTION_BAD;
+   printfPQExpBuffer(&conn->errorMessage,
+                     libpq_gettext("out of memory\n"));
+   return conn;
 }
 
 
@@ -3761,7 +3815,16 @@ ldapServiceLookup(const char *purl, PQconninfoOption *options,
                if (strcmp(options[i].keyword, optname) == 0)
                {
                    if (options[i].val == NULL)
+                   {
                        options[i].val = strdup(optval);
+                       if (!options[i].val)
+                       {
+                           printfPQExpBuffer(errorMessage,
+                                           libpq_gettext("out of memory\n"));
+                           free(result);
+                           return 3;
+                       }
+                   }
                    found_keyword = true;
                    break;
                }
@@ -3984,6 +4047,13 @@ parseServiceFile(const char *serviceFile,
                    {
                        if (options[i].val == NULL)
                            options[i].val = strdup(val);
+                       if (!options[i].val)
+                       {
+                           printfPQExpBuffer(errorMessage,
+                                           libpq_gettext("out of memory\n"));
+                           fclose(f);
+                           return 3;
+                       }
                        found_keyword = true;
                        break;
                    }
@@ -4411,6 +4481,14 @@ conninfo_array_parse(const char **keywords, const char **values,
                                if (options[k].val)
                                    free(options[k].val);
                                options[k].val = strdup(str_option->val);
+                               if (!options[k].val)
+                               {
+                                   printfPQExpBuffer(errorMessage,
+                                                     libpq_gettext("out of memory\n"));
+                                   PQconninfoFree(options);
+                                   PQconninfoFree(str_options);
+                                   return NULL;
+                               }
                                break;
                            }
                        }
@@ -4430,6 +4508,7 @@ conninfo_array_parse(const char **keywords, const char **values,
                    printfPQExpBuffer(errorMessage,
                                      libpq_gettext("out of memory\n"));
                    PQconninfoFree(options);
+                   PQconninfoFree(str_options);
                    return NULL;
                }
            }