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authorJan Kara <jack@suse.cz>2009-02-10 11:15:34 -0500
committerTheodore Tso <tytso@mit.edu>2009-02-10 11:15:34 -0500
commit7f5aa215088b817add9c71914b83650bdd49f8a9 (patch)
tree9b811d1f0b41a2738fc68654ae605bf5d8cf2a72 /fs/ocfs2/journal.h
parent9eddacf9e9c03578ef2c07c9534423e823d677f8 (diff)
downloadop-kernel-dev-7f5aa215088b817add9c71914b83650bdd49f8a9.zip
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jbd2: Avoid possible NULL dereference in jbd2_journal_begin_ordered_truncate()
If we race with commit code setting i_transaction to NULL, we could possibly dereference it. Proper locking requires the journal pointer (to access journal->j_list_lock), which we don't have. So we have to change the prototype of the function so that filesystem passes us the journal pointer. Also add a more detailed comment about why the function jbd2_journal_begin_ordered_truncate() does what it does and how it should be used. Thanks to Dan Carpenter <error27@gmail.com> for pointing to the suspitious code. Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Acked-by: Joel Becker <joel.becker@oracle.com> CC: linux-ext4@vger.kernel.org CC: ocfs2-devel@oss.oracle.com CC: mfasheh@suse.de CC: Dan Carpenter <error27@gmail.com>
Diffstat (limited to 'fs/ocfs2/journal.h')
-rw-r--r--fs/ocfs2/journal.h6
1 files changed, 4 insertions, 2 deletions
diff --git a/fs/ocfs2/journal.h b/fs/ocfs2/journal.h
index 3c3532e..172850a 100644
--- a/fs/ocfs2/journal.h
+++ b/fs/ocfs2/journal.h
@@ -513,8 +513,10 @@ static inline int ocfs2_jbd2_file_inode(handle_t *handle, struct inode *inode)
static inline int ocfs2_begin_ordered_truncate(struct inode *inode,
loff_t new_size)
{
- return jbd2_journal_begin_ordered_truncate(&OCFS2_I(inode)->ip_jinode,
- new_size);
+ return jbd2_journal_begin_ordered_truncate(
+ OCFS2_SB(inode->i_sb)->journal->j_journal,
+ &OCFS2_I(inode)->ip_jinode,
+ new_size);
}
#endif /* OCFS2_JOURNAL_H */
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