diff --git a/cmd/zpool/zpool_main.c b/cmd/zpool/zpool_main.c
index dd0fb0b304..35b0bdc478 100644
--- a/cmd/zpool/zpool_main.c
+++ b/cmd/zpool/zpool_main.c
@@ -3243,7 +3243,7 @@ print_scan_status(pool_scan_stat_t *ps)
 	 */
 	if (ps->pss_state == DSS_FINISHED) {
 		uint64_t minutes_taken = (end - start) / 60;
-		char *fmt;
+		char *fmt = NULL;
 
 		if (ps->pss_func == POOL_SCAN_SCRUB) {
 			fmt = gettext("scrub repaired %s in %lluh%um with "
diff --git a/module/zfs/dmu_objset.c b/module/zfs/dmu_objset.c
index 690e6ecdee..9bd09c9db6 100644
--- a/module/zfs/dmu_objset.c
+++ b/module/zfs/dmu_objset.c
@@ -1215,7 +1215,7 @@ dmu_objset_userquota_get_ids(dnode_t *dn, boolean_t before, dmu_tx_t *tx)
 	objset_t *os = dn->dn_objset;
 	void *data = NULL;
 	dmu_buf_impl_t *db = NULL;
-	uint64_t *user, *group;
+	uint64_t *user = NULL, *group = NULL;
 	int flags = dn->dn_id_flags;
 	int error;
 	boolean_t have_spill = B_FALSE;
diff --git a/module/zfs/sa.c b/module/zfs/sa.c
index a91b379f99..cf232c2b64 100644
--- a/module/zfs/sa.c
+++ b/module/zfs/sa.c
@@ -637,7 +637,7 @@ sa_build_layouts(sa_handle_t *hdl, sa_bulk_attr_t *attr_desc, int attr_count,
 	int buf_space;
 	sa_attr_type_t *attrs, *attrs_start;
 	int i, lot_count;
-	int hdrsize, spillhdrsize;
+	int hdrsize, spillhdrsize = 0;
 	int used;
 	dmu_object_type_t bonustype;
 	sa_lot_t *lot;
@@ -1541,7 +1541,7 @@ sa_modify_attrs(sa_handle_t *hdl, sa_attr_type_t newattr,
 	sa_bulk_attr_t *attr_desc;
 	void *old_data[2];
 	int bonus_attr_count = 0;
-	int bonus_data_size, spill_data_size;
+	int bonus_data_size = 0, spill_data_size = 0;
 	int spill_attr_count = 0;
 	int error;
 	uint16_t length;
diff --git a/module/zfs/zil.c b/module/zfs/zil.c
index 4aa4d10b07..ff25fd2233 100644
--- a/module/zfs/zil.c
+++ b/module/zfs/zil.c
@@ -287,6 +287,8 @@ zil_parse(zilog_t *zilog, zil_parse_blk_func_t *parse_blk_func,
 	char *lrbuf, *lrp;
 	int error = 0;
 
+	bzero(&next_blk, sizeof(blkptr_t));
+
 	/*
 	 * Old logs didn't record the maximum zh_claim_lr_seq.
 	 */
@@ -308,7 +310,7 @@ zil_parse(zilog_t *zilog, zil_parse_blk_func_t *parse_blk_func,
 	for (blk = zh->zh_log; !BP_IS_HOLE(&blk); blk = next_blk) {
 		uint64_t blk_seq = blk.blk_cksum.zc_word[ZIL_ZC_SEQ];
 		int reclen;
-		char *end;
+		char *end = NULL;
 
 		if (blk_seq > claim_blk_seq)
 			break;