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

Eric Sandeen
2016-01-22T18:25:42Z

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(-)

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);
--
1.7.1