linux-ext4 - Re: [PATCH 01/22] jbd2: Fix possible overflow in jbd2_log_space

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20191021010839.GC6799@mit.edu>
Date:   Sun, 20 Oct 2019 21:08:39 -0400
From:   "Theodore Y. Ts'o" <tytso@....edu>
To:     Jan Kara <jack@...e.cz>
Cc:     linux-ext4@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH 01/22] jbd2: Fix possible overflow in
 jbd2_log_space_left()

On Fri, Oct 04, 2019 at 12:05:47AM +0200, Jan Kara wrote:
> 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@...r.kernel.org
> Signed-off-by: Jan Kara <jack@...e.cz>

Looks good, you can add:

Reviewed-by: Theodore Ts'o <tytso@....edu>