Commit cc07eed8 authored Mar 15, 2016 by Eric Sandeen Committed by Dave Chinner Mar 15, 2016

xfs: ensure committed is initialized in xfs_trans_roll



__xfs_trans_roll() can return without setting the
*committed argument; this was a problem for xfs_bmap_finish():

        int       committed;/* xact committed or not */
...
        error = __xfs_trans_roll(tp, ip, &committed);
        if (error) {
...
                if (committed) {

and we tested an uninitialized "committed" variable on the
error path.  No caller is preserving "committed" state across
calls to __xfs_trans_roll(), so just initialize committed inside
the function to avoid future errors like this.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dave Chinner <david@fromorbit.com>

parent d34999c9

fs/xfs/xfs_trans.c

+3 −1

Original line number	Diff line number	Diff line
		@@ -1028,6 +1028,8 @@ __xfs_trans_roll(
		struct xfs_trans_res tres;
		int error;

		*committed = 0;

		/*
		* Ensure that the inode is always logged.
		*/
		@@ -1082,6 +1084,6 @@ xfs_trans_roll(
		struct xfs_trans **tpp,
		struct xfs_inode *dp)
		{
		int committed = 0;
		int committed;
		return __xfs_trans_roll(tpp, dp, &committed);
		}