tree dbaf4cf28687184170b326f115415edea8686b2d
parent 97d3f2b56b7368dcb52ece9ae7efdba899cf14bc
author Theodore Ts'o <tytso@mit.edu> 1529194905 -0400
committer Todd Kjos <tkjos@google.com> 1551893902 -0800

jbd2: don't mark block as modified if the handle is out of credits

commit e09463f220ca9a1a1ecfda84fcda658f99a1f12a upstream.

Do not set the b_modified flag in block's journal head should not
until after we're sure that jbd2_journal_dirty_metadat() will not
abort with an error due to there not being enough space reserved in
the jbd2 handle.

Otherwise, future attempts to modify the buffer may lead a large
number of spurious errors and warnings.

This addresses CVE-2018-10883.

https://bugzilla.kernel.org/show_bug.cgi?id=200071

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>