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jbd2: Add error check to journal_wait_on_commit_record to avoid oops 

The buffer head pointer passed to journal_wait_on_commit_record() could
be NULL if the previous journal_submit_commit_record() failed or journal
has already aborted.

Looking at the jbd2 debug messages, before the oops happened, the jbd2
is aborted due to trying to access the next log block beyond the end
of device. This might be caused by using a corrupted image.

We need to check the error returns from journal_submit_commit_record()
and avoid calling journal_wait_on_commit_record() in the failure case.

This addresses Kernel Bugzilla #9849

Signed-off-by: Mingming Cao <cmm@us.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Mingming Cao 2008-02-05 08:52:45 -05:00 committed by Theodore Ts'o
parent 531021f2ca
commit b048d84626
1 changed files with 2 additions and 1 deletions
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3
fs/jbd2/commit.c
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@ -872,7 +872,8 @@ void jbd2_journal_commit_transaction(journal_t *journal)
if (err)
__jbd2_journal_abort_hard(journal);
}
err = journal_wait_on_commit_record(cbh);
if (!err && !is_journal_aborted(journal))
err = journal_wait_on_commit_record(cbh);
if (err)
jbd2_journal_abort(journal, err);