This is a note to let you know that I've just added the patch titled
ext4: avoid clearing beyond i_blocks when truncating an inline data file
to the 3.12-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ext4-avoid-clearing-beyond-i_blocks-when-truncating-an-inline-data-file.patch
and it can be found in the queue-3.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 09c455aaa8f47a94d5bafaa23d58365768210507 Mon Sep 17 00:00:00 2001
From: Theodore Ts'o <tytso@xxxxxxx>
Date: Tue, 7 Jan 2014 12:58:19 -0500
Subject: ext4: avoid clearing beyond i_blocks when truncating an inline data file
From: Theodore Ts'o <tytso@xxxxxxx>
commit 09c455aaa8f47a94d5bafaa23d58365768210507 upstream.
A missing cast means that when we are truncating a file which is less
than 60 bytes, we don't clear the correct area of memory, and in fact
we can end up truncating the next inode in the inode table, or worse
yet, some other kernel data structure.
Addresses-Coverity-Id: #751987
Signed-off-by: "Theodore Ts'o" <tytso@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/ext4/inline.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
--- a/fs/ext4/inline.c
+++ b/fs/ext4/inline.c
@@ -1925,9 +1925,11 @@ void ext4_inline_data_truncate(struct in
}
/* Clear the content within i_blocks. */
- if (i_size < EXT4_MIN_INLINE_DATA_SIZE)
- memset(ext4_raw_inode(&is.iloc)->i_block + i_size, 0,
- EXT4_MIN_INLINE_DATA_SIZE - i_size);
+ if (i_size < EXT4_MIN_INLINE_DATA_SIZE) {
+ void *p = (void *) ext4_raw_inode(&is.iloc)->i_block;
+ memset(p + i_size, 0,
+ EXT4_MIN_INLINE_DATA_SIZE - i_size);
+ }
EXT4_I(inode)->i_inline_size = i_size <
EXT4_MIN_INLINE_DATA_SIZE ?
Patches currently in stable-queue which might be from tytso@xxxxxxx are
queue-3.12/ext4-avoid-clearing-beyond-i_blocks-when-truncating-an-inline-data-file.patch
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