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authorJan Kara <jack@suse.cz>2017-01-27 22:35:38 +0300
committerTheodore Ts'o <tytso@mit.edu>2017-01-27 22:35:38 +0300
commit3b136499e906460919f0d21a49db1aaccf0ae963 (patch)
tree9da71e2dcd4f4d90b21ed5ec7a4c9cb44c0b0194 /fs/jbd2
parentcd648b8a8fd5071d232242d5ee7ee3c0815776af (diff)
downloadlinux-3b136499e906460919f0d21a49db1aaccf0ae963.tar.xz
ext4: fix data corruption in data=journal mode
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. CC: stable@vger.kernel.org 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>
Diffstat (limited to 'fs/jbd2')
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