| From | Greg Kroah-Hartman <> | Subject | [PATCH 3.12 090/133] ext4: avoid clearing beyond i_blocks when truncating an inline data file | Date | Tue, 4 Feb 2014 13:08:11 -0800 |
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3.12-stable review patch. If anyone has any objections, please let me know.
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From: Theodore Ts'o <tytso@mit.edu>
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@mit.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- 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 ?
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