linux-ext4 - ext4: Fix use after free issues with journalled data

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Message-Id: <20200421085445.5731-1-jack@suse.cz>
Date:   Tue, 21 Apr 2020 10:54:42 +0200
From:   Jan Kara <jack@...e.cz>
To:     Ted Tso <tytso@....edu>
Cc:     <linux-ext4@...r.kernel.org>, <linux-fsdevel@...r.kernel.org>,
        Eric Sandeen <sandeen@...deen.net>, Jan Kara <jack@...e.cz>
Subject: ext4: Fix use after free issues with journalled data

Hello,

this series of patches fixes possible use-after-free issues resulting from
freed inode being still in writeback list. One partner was able to trigger
this using fsstress on filesystem on pmem device. The first patch fixes
mostly a theoretical issue, the third patch fixes a real issue happening
in the wild and leading to kernel crashing.

								Honza