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author | Jan Kara <jack@suse.cz> | 2019-11-05 17:44:07 +0100 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-12-13 08:52:43 +0100 |
commit | 3152fcd479eeae2eeaa44b553adf05a1ccac7637 (patch) | |
tree | d31ca599c5fd3079eb48de035c07864aa3e5b1b8 /usr | |
parent | 18493bac1ae0fd613243c885503142559ec5f1ac (diff) | |
download | linux-stable-3152fcd479eeae2eeaa44b553adf05a1ccac7637.tar.gz linux-stable-3152fcd479eeae2eeaa44b553adf05a1ccac7637.tar.bz2 linux-stable-3152fcd479eeae2eeaa44b553adf05a1ccac7637.zip |
jbd2: Fix possible overflow in jbd2_log_space_left()
commit add3efdd78b8a0478ce423bb9d4df6bd95e8b335 upstream.
When number of free space in the journal is very low, the arithmetic in
jbd2_log_space_left() could underflow resulting in very high number of
free blocks and thus triggering assertion failure in transaction commit
code complaining there's not enough space in the journal:
J_ASSERT(journal->j_free > 1);
Properly check for the low number of free blocks.
CC: stable@vger.kernel.org
Reviewed-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20191105164437.32602-1-jack@suse.cz
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'usr')
0 files changed, 0 insertions, 0 deletions