psql: Fix memory leak with repeated calls of \bind

Calling \bind repeatedly would cause the memory allocated for the list
of bind parameters to be leaked after each call, as the list is reset
when beginning a single call.

This issue is fixed by making the cleanup of the bind parameter list
more aggressive, refactoring it into a single routine called after
processing a query and before running an individual \bind.

HEAD required more surgery and has been fixed by 87eeadaea143.  Issue
introduced by 5b66de3433e2.

Reported-by: Anthonin Bonnefoy
Discussion: https://postgr.es/m/2e5b89af-a351-ff0a-000c-037ac28314ab@gmail.com
Backpatch-through: 16

diff --git a/src/bin/psql/command.c b/src/bin/psql/command.c
index 180781ecd05250c4aaf405884b76ccb63ebee9ae..4d2c81aa753cafc06cf5f6d519183a7c5a24c3e1 100644 (file)
--- a/src/bin/psql/command.c
+++ b/src/bin/psql/command.c
@@ -471,7 +471,7 @@ exec_command_bind(PsqlScanState scan_state, bool active_branch)
        int         nparams = 0;
        int         nalloc = 0;
 
-       pset.bind_params = NULL;
+       clean_bind_state();
 
        while ((opt = psql_scan_slash_option(scan_state, OT_NORMAL, NULL, false)))
        {

diff --git a/src/bin/psql/common.c b/src/bin/psql/common.c
index fe8e049c4c1a243973d9be560ec001b78cce99aa..4a50eb1e672eff811611988d04f45ce04462e4b0 100644 (file)
--- a/src/bin/psql/common.c
+++ b/src/bin/psql/common.c
@@ -1275,14 +1275,7 @@ sendquery_cleanup:
    }
 
    /* clean up after \bind */
-   if (pset.bind_flag)
-   {
-       for (i = 0; i < pset.bind_nparams; i++)
-           free(pset.bind_params[i]);
-       free(pset.bind_params);
-       pset.bind_params = NULL;
-       pset.bind_flag = false;
-   }
+   clean_bind_state();
 
    /* reset \gset trigger */
    if (pset.gset_prefix)
@@ -2252,6 +2245,26 @@ uri_prefix_length(const char *connstr)
    return 0;
 }
 
+/*
+ * Reset state related to \bind
+ *
+ * Clean up any state related to bind parameters and bind_flag.  This needs
+ * to be called after processing a query or when running \bind.
+ */
+void
+clean_bind_state(void)
+{
+   if (pset.bind_flag)
+   {
+       for (int i = 0; i < pset.bind_nparams; i++)
+           free(pset.bind_params[i]);
+       free(pset.bind_params);
+   }
+
+   pset.bind_params = NULL;
+   pset.bind_flag = false;
+}
+
 /*
  * Recognized connection string either starts with a valid URI prefix or
  * contains a "=" in it.

diff --git a/src/bin/psql/common.h b/src/bin/psql/common.h
index 6efe12274fe593cf07cc209afbe9fbe74af62dcf..9baa1e890649197ae43c04c7f2984605bd16a67b 100644 (file)
--- a/src/bin/psql/common.h
+++ b/src/bin/psql/common.h
@@ -41,6 +41,7 @@ extern bool standard_strings(void);
 extern const char *session_username(void);
 
 extern void expand_tilde(char **filename);
+extern void clean_bind_state(void);
 
 extern bool recognized_connection_string(const char *connstr);