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From: Jiri Vymazal <jvymazal@redhat.com>
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Date: Thu, 14 Mar 2019 10:58:03 +0100
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Subject: [PATCH] Journal cursor related fixes
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Added missing free() calls of received journal cursor
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In one case there was possibility of free()'d value of journal
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cursor not being reset, causing double-free and crash later on.
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Not trying to get and save position of invalid journal
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---
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plugins/imjournal/imjournal.c | 28 +++++----
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1 file changed, 15 insertions(+), 13 deletitions(-)
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diff --git a/plugins/imjournal/imjournal.c b/plugins/imjournal/imjournal.c
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index a85e52100..f5c2be4b6 100644
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--- a/plugins/imjournal/imjournal.c
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+++ b/plugins/imjournal/imjournal.c
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@@ -121,7 +121,7 @@
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#define J_PROCESS_PERIOD 1024 /* Call sd_journal_process() every 1,024 records */
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-static rsRetVal persistJournalState(void);
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+static rsRetVal persistJournalState(int trySave);
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static rsRetVal loadJournalState(void);
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static rsRetVal openJournal(sd_journal** jj) {
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@@ -140,10 +140,10 @@
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RETiRet;
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}
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-static void closeJournal(sd_journal** jj) {
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+static void closeJournal(sd_journal** jj, int trySave) {
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if (cs.stateFile) { /* can't persist without a state file */
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- persistJournalState();
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+ persistJournalState(trySave);
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}
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sd_journal_close(*jj);
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j_inotify_fd = 0;
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@@ -433,7 +434,7 @@
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/* This function gets journal cursor and saves it into state file
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*/
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static rsRetVal
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-persistJournalState (void)
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+persistJournalState(int trySave)
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{
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DEFiRet;
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FILE *sf; /* state file */
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@@ -443,12 +444,13 @@
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if (cs.bWorkAroundJournalBug) {
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if (!last_cursor)
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ABORT_FINALIZE(RS_RET_OK);
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-
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- } else if ((ret = sd_journal_get_cursor(j, &last_cursor)) < 0) {
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- char errStr[256];
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- rs_strerror_r(-(ret), errStr, sizeof(errStr));
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- errmsg.LogError(0, RS_RET_ERR, "sd_journal_get_cursor() failed: '%s'\n", errStr);
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- ABORT_FINALIZE(RS_RET_ERR);
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+ } else if (trySave) {
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+ if ((ret = sd_journal_get_cursor(j, &last_cursor))) {
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+ LogError(-ret, RS_RET_ERR, "imjournal: sd_journal_get_cursor() failed");
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+ ABORT_FINALIZE(RS_RET_ERR);
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+ }
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+ } else { /* not trying to get cursor out of invalid journal state */
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+ ABORT_FINALIZE(RS_RET_OK);
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}
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/* we create a temporary name by adding a ".tmp"
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* suffix to the end of our state file's name
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@@ -501,7 +506,7 @@
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r = sd_journal_wait(j, POLL_TIMEOUT);
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if (r == SD_JOURNAL_INVALIDATE) {
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- closeJournal(&j);
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+ closeJournal(&j, 0);
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iRet = openJournal(&j);
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if (iRet != RS_RET_OK)
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@@ -628,7 +634,7 @@
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tryRecover(void) {
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errmsg.LogMsg(0, RS_RET_OK, LOG_INFO, "imjournal: trying to recover from unexpected "
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"journal error");
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- closeJournal(&j);
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+ closeJournal(&j, 1);
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srSleep(10, 0); // do not hammer machine with too-frequent retries
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openJournal(&j);
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}
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@@ -708,7 +708,7 @@
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if (cs.stateFile) { /* can't persist without a state file */
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/* TODO: This could use some finer metric. */
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if ((count % cs.iPersistStateInterval) == 0) {
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- persistJournalState();
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+ persistJournalState(1);
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}
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}
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}
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@@ -764,7 +764,7 @@
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/* close journal */
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BEGINafterRun
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CODESTARTafterRun
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- closeJournal(&j);
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+ closeJournal(&j, 1);
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ratelimitDestruct(ratelimiter);
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ENDafterRun
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