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Module CLIENT_CHANGE, Fix crash on free blocked client with DB!=0 (#11500) 

In moduleFireServerEvent we change the real client DB to 0 on freeClient in case the event is REDISMODULE_EVENT_CLIENT_CHANGE.
It results in a crash if the client is blocked on a key on other than DB 0.

The DB change is not necessary even for module-client, as we set its DB to 0 on either createClient or moduleReleaseTempClient.

Co-authored-by: Madelyn Olson <34459052+madolson@users.noreply.github.com>
Co-authored-by: Binbin <binloveplay1314@qq.com>
Co-authored-by: Oran Agra <oran@redislabs.com>
(cherry picked from commit e4eb18b303)
This commit is contained in:
uriyage 2022-11-15 00:40:35 +02:00 committed by Oran Agra
parent 4ac3d79bfc
commit 39e5a6fa2f
2 changed files with 15 additions and 1 deletions
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3
src/module.c
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@ -8321,7 +8321,8 @@ void moduleFireServerEvent(uint64_t eid, int subid, void *data) {
* up to the specific event setup to change it when it makes
* sense. For instance for FLUSHDB events we select the correct
* DB automatically. */
selectDb(ctx.client, 0);
if (!real_client_used)
selectDb(ctx.client, 0);
/* Event specific context and data pointer setup. */
if (eid == REDISMODULE_EVENT_CLIENT_CHANGE) {

13
tests/unit/moduleapi/hooks.tcl
View File

@ -12,6 +12,19 @@ tags "modules" {
assert {[r hooks.event_count client-disconnected] > 1}
}
test {Test module client change event for blocked client} {
set rd [redis_deferring_client]
# select db other than 0
$rd select 1
# block on key
$rd brpop foo 0
# kill blocked client
r client kill skipme yes
# assert server is still up
assert_equal [r ping] PONG
$rd close
}
test {Test module cron hook} {
after 100
assert {[r hooks.event_count cron-loop] > 0}