Thread (2 messages) 2 messages, 2 authors, 2012-10-25

Re: [PATCH v2] Btrfs: fix memory leak when cloning root's node

From: Jan Schmidt <hidden>
Date: 2012-10-25 13:42:58

Chris: If you're not done yet, please put this one on top of the rc3-pile.
Otherwise this can wait for the next rc as well.

On Thu, October 25, 2012 at 15:30 (+0200), Liu Bo wrote:
quoted hunk ↗ jump to hunk
After cloning root's node, we forgot to dec the src's ref
which can lead to a memory leak.

Signed-off-by: Liu Bo <redacted>
---
v1->v2: fix a typo.

 fs/btrfs/ctree.c |    8 +++++---
 1 files changed, 5 insertions(+), 3 deletions(-)
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index eba44b0..cdfb4c4 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -1241,6 +1241,7 @@ get_old_root(struct btrfs_root *root, u64 time_seq)
 {
 	struct tree_mod_elem *tm;
 	struct extent_buffer *eb;
+	struct extent_buffer *old;
 	struct tree_mod_root *old_root = NULL;
 	u64 old_generation = 0;
 	u64 logical;
@@ -1264,13 +1265,14 @@ get_old_root(struct btrfs_root *root, u64 time_seq)
 		btrfs_tree_read_unlock(root->node);
 		free_extent_buffer(root->node);
 		blocksize = btrfs_level_size(root, old_root->level);
-		eb = read_tree_block(root, logical, blocksize, 0);
-		if (!eb) {
+		old = read_tree_block(root, logical, blocksize, 0);
+		if (!old) {
 			pr_warn("btrfs: failed to read tree block %llu from get_old_root\n",
 				logical);
 			WARN_ON(1);
 		} else {
-			eb = btrfs_clone_extent_buffer(eb);
+			eb = btrfs_clone_extent_buffer(old);
+			free_extent_buffer(old);
 		}
 	} else if (old_root) {
 		btrfs_tree_read_unlock(root->node);
Reviewed-by: Jan Schmidt <redacted>

Thanks :-)
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