Date: Mon, 27 Mar 2023 08:16:37 GMT From: Kristof Provost <kp@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org Subject: git: 3eb2341caaa3 - stable/13 - pfsync: add missing unlock in pfsync_defer_tmo() Message-ID: <202303270816.32R8GbQk045637@gitrepo.freebsd.org>
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The branch stable/13 has been updated by kp: URL: https://cgit.FreeBSD.org/src/commit/?id=3eb2341caaa307a8d067333c8aebe3e269ade2fd commit 3eb2341caaa307a8d067333c8aebe3e269ade2fd Author: Kristof Provost <kp@FreeBSD.org> AuthorDate: 2023-03-20 13:26:33 +0000 Commit: Kristof Provost <kp@FreeBSD.org> CommitDate: 2023-03-27 08:16:03 +0000 pfsync: add missing unlock in pfsync_defer_tmo() The callout for pfsync_defer_tmo() is created with CALLOUT_RETURNUNLOCKED, because while the callout framework takes care of taking the lock we want to run a few operations outside of the lock, so we unlock ourselves. However, if `sc->sc_sync_if == NULL` we return without releasing the lock, and leak the lock, causing later deadlocks. Ensure we always release the bucket lock when we exit pfsync_defer_tmo() PR: 268246 MFC after: 1 week Sponsored by: Rubicon Communications, LLC (Netgate) (cherry picked from commit 844ad2828a35c434b893af4274b1f6c50332dd70) --- sys/netpfil/pf/if_pfsync.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/sys/netpfil/pf/if_pfsync.c b/sys/netpfil/pf/if_pfsync.c index 3b3d263fcf8b..0a8ece621006 100644 --- a/sys/netpfil/pf/if_pfsync.c +++ b/sys/netpfil/pf/if_pfsync.c @@ -1830,8 +1830,10 @@ pfsync_defer_tmo(void *arg) PFSYNC_BUCKET_LOCK_ASSERT(b); - if (sc->sc_sync_if == NULL) + if (sc->sc_sync_if == NULL) { + PFSYNC_BUCKET_UNLOCK(b); return; + } NET_EPOCH_ENTER(et); CURVNET_SET(sc->sc_sync_if->if_vnet);
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