From: Kaho Ng <ngkaho1234@gmail.com>
Date: Tue, 28 Jun 2016 09:18:52 +0000 (+0800)
Subject: ext4_journal: fix memory leakage when revoking a block repeatedly
X-Git-Url: https://git.carlh.net/gitweb/?p=lwext4.git;a=commitdiff_plain;h=358f3f8f49a50ea3f2032a31eb73f16411fad8a4

ext4_journal: fix memory leakage when revoking a block repeatedly
---

diff --git a/src/ext4_journal.c b/src/ext4_journal.c
index 1f70c81..01a8c08 100644
--- a/src/ext4_journal.c
+++ b/src/ext4_journal.c
@@ -1656,8 +1656,16 @@ int jbd_trans_set_block_dirty(struct jbd_trans *trans,
 int jbd_trans_revoke_block(struct jbd_trans *trans,
 			   ext4_fsblk_t lba)
 {
-	struct jbd_revoke_rec *rec =
-		calloc(1, sizeof(struct jbd_revoke_rec));
+	struct jbd_revoke_rec tmp_rec = {
+		.lba = lba
+	}, *rec;
+	rec = RB_FIND(jbd_revoke_tree,
+		      &trans->revoke_root,
+		      &tmp_rec);
+	if (rec)
+		return EOK;
+
+	rec = calloc(1, sizeof(struct jbd_revoke_rec));
 	if (!rec)
 		return ENOMEM;