• Theodore Ts'o's avatar
    ext4: set h_journal if there is a failure starting a reserved handle · b2569260
    Theodore Ts'o authored
    If ext4 tries to start a reserved handle via
    jbd2_journal_start_reserved(), and the journal has been aborted, this
    can result in a NULL pointer dereference.  This is because the fields
    h_journal and h_transaction in the handle structure share the same
    memory, via a union, so jbd2_journal_start_reserved() will clear
    h_journal before calling start_this_handle().  If this function fails
    due to an aborted handle, h_journal will still be NULL, and the call
    to jbd2_journal_free_reserved() will pass a NULL journal to
    This can be reproduced by running "kvm-xfstests -c dioread_nolock
    Cc: stable@kernel.org # 3.11
    Fixes: 8f7d89f3 ("jbd2: transaction reservation support")
    Signed-off-by: Theodore Ts'o's avatarTheodore Ts'o <tytso@mit.edu>
    Reviewed-by: default avatarAndreas Dilger <adilger@dilger.ca>
    Reviewed-by: default avatarJan Kara <jack@suse.cz>
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