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

To: linux-fsdevel@xxxxxxxxxxxxxxx, xfs@xxxxxxxxxxx
Subject: [PATCH 4/7] xfs: don't overflow quota ID when initializing dqblk
From: Eric Sandeen <sandeen@xxxxxxxxxx>
Date: Thu, 21 Jan 2016 22:07:21 -0600
Cc: jack@xxxxxxx
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <1453435644-32261-1-git-send-email-sandeen@xxxxxxxxxx>
References: <1453435644-32261-1-git-send-email-sandeen@xxxxxxxxxx>
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@xxxxxxxxxx>
---
 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

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