Avoid overflow in MaybeRemoveOldWalSummaries().

This commit limits the maximum value of wal_summary_keep_time to
INT_MAX / SECS_PER_MINUTE to avoid overflow when it is converted to
seconds.  In passing, use the HOURS_PER_DAY, MINS_PER_HOUR, and
SECS_PER_MINUTE macros in the code for this GUC instead of hard-
coding those values.

Discussion: https://postgr.es/m/20240314210010.GA3056455%40nathanxps13

diff --git a/src/backend/postmaster/walsummarizer.c b/src/backend/postmaster/walsummarizer.c
index b412d0eb86627981a6a09c9c5c2eabfbfc6af869..0cd5080fa78c1c46a4676231a0145c8498bc2e56 100644 (file)
--- a/src/backend/postmaster/walsummarizer.c
+++ b/src/backend/postmaster/walsummarizer.c
@@ -140,7 +140,7 @@ static XLogRecPtr redo_pointer_at_last_summary_removal = InvalidXLogRecPtr;
  * GUC parameters
  */
 bool       summarize_wal = false;
-int            wal_summary_keep_time = 10 * 24 * 60;
+int            wal_summary_keep_time = 10 * HOURS_PER_DAY * MINS_PER_HOUR;
 
 static void WalSummarizerShutdown(int code, Datum arg);
 static XLogRecPtr GetLatestLSN(TimeLineID *tli);
@@ -1480,7 +1480,7 @@ MaybeRemoveOldWalSummaries(void)
     * Files should only be removed if the last modification time precedes the
     * cutoff time we compute here.
     */
-   cutoff_time = time(NULL) - 60 * wal_summary_keep_time;
+   cutoff_time = time(NULL) - wal_summary_keep_time * SECS_PER_MINUTE;
 
    /* Get all the summaries that currently exist. */
    wslist = GetWalSummaries(0, InvalidXLogRecPtr, InvalidXLogRecPtr);

diff --git a/src/backend/utils/misc/guc_tables.c b/src/backend/utils/misc/guc_tables.c
index 57d9de4dd92deb3202fa6ff5f0be5f967b49882d..1e71e7db4a098f56e1f5092eabbb3f7e14465f83 100644 (file)
--- a/src/backend/utils/misc/guc_tables.c
+++ b/src/backend/utils/misc/guc_tables.c
@@ -3293,9 +3293,9 @@ struct config_int ConfigureNamesInt[] =
            GUC_UNIT_MIN,
        },
        &wal_summary_keep_time,
-       10 * 24 * 60,           /* 10 days */
+       10 * HOURS_PER_DAY * MINS_PER_HOUR, /* 10 days */
        0,
-       INT_MAX,
+       INT_MAX / SECS_PER_MINUTE,
        NULL, NULL, NULL
    },