linux-kernel - [PATCH 1/1] Btrfs: avoid using NULL compressed_pages in insert_inline

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Message-Id: <1429948974-24767-1-git-send-email-fabf@skynet.be>
Date:	Sat, 25 Apr 2015 10:02:54 +0200
From:	Fabian Frederick <fabf@...net.be>
To:	linux-kernel@...r.kernel.org
Cc:	Fabian Frederick <fabf@...net.be>, Chris Mason <clm@...com>,
	Josef Bacik <jbacik@...com>, David Sterba <dsterba@...e.cz>,
	linux-btrfs@...r.kernel.org
Subject: [PATCH 1/1] Btrfs: avoid using NULL compressed_pages in  insert_inline_extent()

insert_inline_extent() checked for compressed_pages to be NULL then
it accessed it under compress_type != BTRFS_COMPRESS_NONE.
This patch adds a BUG() when compress_size != 0, compress_type !=
BTRFS_COMPRESS_NONE and compressed_pages == 0.

Signed-off-by: Fabian Frederick <fabf@...net.be>
---
 fs/btrfs/inode.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index ada4d24..449653d 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -150,8 +150,12 @@ static int insert_inline_extent(struct btrfs_trans_handle *trans,
 	size_t cur_size = size;
 	unsigned long offset;
 
-	if (compressed_size && compressed_pages)
-		cur_size = compressed_size;
+	if (compressed_size) {
+		if (compressed_pages)
+			cur_size = compressed_size;
+		else if (compress_type != BTRFS_COMPRESS_NONE)
+			BUG();
+	}
 
 	inode_add_bytes(inode, size);
 
-- 
1.9.1

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