ext4: fix data corruption in data=journal mode

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commit 3b136499e9 upstream.

ext4_journalled_write_end() did not propely handle all the cases when
generic_perform_write() did not copy all the data into the target page
and could mark buffers with uninitialized contents as uptodate and dirty
leading to possible data corruption (which would be quickly fixed by
generic_perform_write() retrying the write but still). Fix the problem
by carefully handling the case when the page that is written to is not
uptodate.

Reported-by: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Jan Kara 2017-01-27 14:35:38 -05:00 • committed by Greg Kroah-Hartman

parent fc6c2da174

commit a5a9cf387d

1 changed files with 13 additions and 10 deletions

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fs/ext4/inode.c

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