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ocfs2: fix NULL pointer dereference in __ocfs2_change_file_space()

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As ocfs2_fallocate() will invoke __ocfs2_change_file_space() with a NULL
as the first parameter (file), it may trigger a NULL pointer dereferrence
due to a missing check.

Addresses http://bugs.launchpad.net/bugs/1006012

Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
Reported-by: Bret Towe <magnade@gmail.com>
Tested-by: Bret Towe <magnade@gmail.com>
Cc: Sunil Mushran <sunil.mushran@oracle.com>
Acked-by: Joel Becker <jlbec@evilplan.org>
Acked-by: Mark Fasheh <mfasheh@suse.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Luis Henriques 2012-07-11 14:02:10 -07:00 committed by Linus Torvalds
parent 6b4fa63a9e
commit a4e08d001f
1 changed files with 1 additions and 1 deletions
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2
fs/ocfs2/file.c
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@ -1950,7 +1950,7 @@ static int __ocfs2_change_file_space(struct file *file, struct inode *inode,
if (ret < 0)
mlog_errno(ret);
if (file->f_flags & O_SYNC)
if (file && (file->f_flags & O_SYNC))
handle->h_sync = 1;
ocfs2_commit_trans(osb, handle);