Messages in this thread |  | | Subject | Re: [PATCH 2/3] fs: ocfs2: Fix a possible null-pointer dereference in ocfs2_write_end_nolock() | From | Joseph Qi <> | Date | Fri, 26 Jul 2019 17:38:10 +0800 |
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On 19/7/26 11:37, Jia-Ju Bai wrote: > In ocfs2_write_end_nolock(), there are an if statement on lines 1976, > 2047 and 2058, to check whether handle is NULL: > if (handle) > > When handle is NULL, it is used on line 2045: > ocfs2_update_inode_fsync_trans(handle, inode, 1); > oi->i_sync_tid = handle->h_transaction->t_tid; > > Thus, a possible null-pointer dereference may occur. > > To fix this bug, handle is checked before calling > ocfs2_update_inode_fsync_trans(). > > This bug is found by a static analysis tool STCheck written by us. > > Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Looks good. Reviewed-by: Joseph Qi <joseph.qi@linux.alibaba.com>
> --- > fs/ocfs2/aops.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c > index a4c905d6b575..5473bd99043e 100644 > --- a/fs/ocfs2/aops.c > +++ b/fs/ocfs2/aops.c > @@ -2042,7 +2042,8 @@ int ocfs2_write_end_nolock(struct address_space *mapping, > inode->i_mtime = inode->i_ctime = current_time(inode); > di->i_mtime = di->i_ctime = cpu_to_le64(inode->i_mtime.tv_sec); > di->i_mtime_nsec = di->i_ctime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec); > - ocfs2_update_inode_fsync_trans(handle, inode, 1); > + if (handle) > + ocfs2_update_inode_fsync_trans(handle, inode, 1); > } > if (handle) > ocfs2_journal_dirty(handle, wc->w_di_bh); >
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