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fix: dev: Check if logconfig is NULL before using it in isc_log_doit()

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Check if 'lctx->logconfig' is NULL before using it in isc_log_doit(),
because it's possible that isc_log_destroy() was already called, e.g.
when a 'call_rcu' function wants to log a message during shutdown.

Closes #4842

Merge branch '4842-shutdown-crash-in-isc_log_doit' into 'main'

Closes #4842

See merge request isc-projects/bind9!9297
This commit is contained in:
Arаm Sаrgsyаn
2024-08-15 12:55:28 +00:00
parent 75021765f8 656e04f48a
commit ebd669a830
1 changed files with 3 additions and 0 deletions
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3
lib/isc/log.c
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@@ -1511,6 +1511,9 @@ isc_log_doit(isc_log_t *lctx, isc_logcategory_t *category,
lctx->buffer[0] = '\0';
isc_logconfig_t *lcfg = rcu_dereference(lctx->logconfig);
if (lcfg == NULL) {
goto unlock;
}
category_channels = ISC_LIST_HEAD(lcfg->channellists[category->id]);