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Fix possible NULL dereference in cd->dlz_destroy()

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If the call to cd->dlz_create() in dlopen_dlz_create() fails, cd->dbdata
may be NULL when dlopen_dlz_destroy() gets called in the cleanup path
and passing NULL to the cd->dlz_destroy() callback may cause a NULL
dereference.  Ensure that does not happen by checking whether cd->dbdata
is non-NULL before calling the cd->dlz_destroy() callback.
This commit is contained in:
Ondřej Surý 2020-10-27 14:18:43 +01:00 committed by Michał Kępień
parent 37b9511ce1
commit 38f34c266d
1 changed files with 1 additions and 1 deletions
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2
bin/named/unix/dlz_dlopen_driver.c
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@ -339,7 +339,7 @@ dlopen_dlz_destroy(void *driverarg, void *dbdata) {
UNUSED(driverarg);
if (cd->dlz_destroy) {
if (cd->dlz_destroy && cd->dbdata) {
MAYBE_LOCK(cd);
cd->dlz_destroy(cd->dbdata);
MAYBE_UNLOCK(cd);