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[4/7] xfs: don't overflow quota ID when initializing dqblk

Message ID 1453487136-12681-5-git-send-email-sandeen@redhat.com (mailing list archive)
State New, archived
Headers show

Commit Message

Eric Sandeen Jan. 22, 2016, 6:25 p.m. UTC 
Quota IDs are unsigned, and so we can pass in values up
to 2^32-1.  But if we try to initialize a block containing
values over MAX_INT, curid will overflow and assert.

curid holds a quota ID, so give it the proper
xfs_dqid_t type (and remove the now-impossible ASSERT).

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
---
 fs/xfs/xfs_dquot.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
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Patch

diff --git a/fs/xfs/xfs_dquot.c b/fs/xfs/xfs_dquot.c
index 9c44d38..c9c7c2d 100644
--- a/fs/xfs/xfs_dquot.c
+++ b/fs/xfs/xfs_dquot.c
@@ -232,7 +232,8 @@  xfs_qm_init_dquot_blk(
 {
 	struct xfs_quotainfo	*q = mp->m_quotainfo;
 	xfs_dqblk_t	*d;
-	int		curid, i;
+	xfs_dqid_t	curid;
+	int		i;
 
 	ASSERT(tp);
 	ASSERT(xfs_buf_islocked(bp));
@@ -243,7 +244,6 @@  xfs_qm_init_dquot_blk(
 	 * ID of the first dquot in the block - id's are zero based.
 	 */
 	curid = id - (id % q->qi_dqperchunk);
-	ASSERT(curid >= 0);
 	memset(d, 0, BBTOB(q->qi_dqchunklen));
 	for (i = 0; i < q->qi_dqperchunk; i++, d++, curid++) {
 		d->dd_diskdq.d_magic = cpu_to_be16(XFS_DQUOT_MAGIC);