linux-ext4 - [PATCH] ext4: Add missing cast in ext4

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Date:	Mon, 25 Jul 2011 16:33:49 +0900
From:	Utako Kusaka <u-kusaka@...jp.nec.com>
To:	linux-ext4@...r.kernel.org, tytso@....edu
Subject: [PATCH] ext4: Add missing cast in ext4_fallocate

Cast map.m_lblk to loff_t.

File size is corrupt when we get an ENOSPC.
Logical block number is __u32, so new_size will be set to overflowed value.

# df -T /mnt/mp1
Filesystem    Type   1K-blocks      Used Available Use% Mounted on
/dev/sda6     ext4     9843276    153056   9190200   2% /mnt/mp1
# fallocate -o 0 -l 2199023251456 /mnt/mp1/testfile
fallocate: /mnt/mp1/testfile: fallocate failed: No space left on device
# stat /mnt/mp1/testfile
  File: `/mnt/mp1/testfile'
  Size: 4293656576	Blocks: 19380440   IO Block: 4096   regular file
Device: 806h/2054d	Inode: 12          Links: 1
Access: (0644/-rw-r--r--)  Uid: (    0/    root)   Gid: (    0/    root)
Access: 2011-07-25 13:01:31.414490496 +0900
Modify: 2011-07-25 13:01:31.414490496 +0900
Change: 2011-07-25 13:01:31.454490495 +0900

Signed-off-by: Utako Kusaka <u-kusaka@...jp.nec.com>
--
 fs/ext4/extents.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index f815cc8..a082f43 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -3835,7 +3835,7 @@ retry:
 						blkbits) >> blkbits))
 			new_size = offset + len;
 		else
-			new_size = (map.m_lblk + ret) << blkbits;
+			new_size = ((loff_t)map.m_lblk + ret) << blkbits;

 		ext4_falloc_update_inode(inode, mode, new_size,
 					 (map.m_flags & EXT4_MAP_NEW));


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