From 07470009be5d7e9d3e81ddcc3c7ac8203693987c Mon Sep 17 00:00:00 2001 From: Alexander Motin Date: Sun, 9 Aug 2015 19:29:10 +0000 Subject: [PATCH] MFV 286542: 5592 NULL pointer dereference in dsl_prop_notify_all_cb() Reviewed by: Dan McDonald Reviewed by: Matthew Ahrens Reviewed by: George Wilson Reviewed by: Will Andrews Approved by: Robert Mustacchi illumos/illumos-gate@9d47dec0481d8cd53b2c1053c96bfa3f78357d6a --- .../opensolaris/uts/common/fs/zfs/dsl_dataset.c | 15 +++++++++++++-- 1 file changed, 13 insertions(+), 2 deletions(-) diff --git a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_dataset.c b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_dataset.c index 3f5569142d60..710be4ab5e1c 100644 --- a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_dataset.c +++ b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_dataset.c @@ -372,8 +372,19 @@ dsl_dataset_snap_remove(dsl_dataset_t *ds, const char *name, dmu_tx_t *tx, boolean_t dsl_dataset_try_add_ref(dsl_pool_t *dp, dsl_dataset_t *ds, void *tag) { - return (dmu_buf_try_add_ref(ds->ds_dbuf, dp->dp_meta_objset, - ds->ds_object, DMU_BONUS_BLKID, tag)); + dmu_buf_t *dbuf = ds->ds_dbuf; + boolean_t result = B_FALSE; + + if (dbuf != NULL && dmu_buf_try_add_ref(dbuf, dp->dp_meta_objset, + ds->ds_object, DMU_BONUS_BLKID, tag)) { + + if (ds == dmu_buf_get_user(dbuf)) + result = B_TRUE; + else + dmu_buf_rele(dbuf, tag); + } + + return (result); } int