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xfs: validate ondisk/incore dquot flags 

While loading dquot records off disk, make sure that the quota type
flags are the same between the incore dquot and the ondisk dquot.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Chandan Babu R <chandanrlinux@gmail.com>
This commit is contained in:
Darrick J. Wong 2020-07-14 10:36:09 -07:00
parent f959b5d037
commit afeda6000b
1 changed files with 20 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

23
fs/xfs/xfs_dquot.c
View File

@ -23,6 +23,7 @@
#include "xfs_trace.h"
#include "xfs_log.h"
#include "xfs_bmap_btree.h"
#include "xfs_error.h"
/*
* Lock order:
@ -524,13 +525,26 @@ xfs_dquot_alloc(
}
/* Copy the in-core quota fields in from the on-disk buffer. */
STATIC void
STATIC int
xfs_dquot_from_disk(
struct xfs_dquot *dqp,
struct xfs_buf *bp)
{
struct xfs_disk_dquot *ddqp = bp->b_addr + dqp->q_bufoffset;
/*
* Ensure that we got the type and ID we were looking for.
* Everything else was checked by the dquot buffer verifier.
*/
if ((ddqp->d_flags & XFS_DQ_ALLTYPES) != dqp->dq_flags ||
ddqp->d_id != dqp->q_core.d_id) {
xfs_alert_tag(bp->b_mount, XFS_PTAG_VERIFIER_ERROR,
"Metadata corruption detected at %pS, quota %u",
__this_address, be32_to_cpu(dqp->q_core.d_id));
xfs_alert(bp->b_mount, "Unmount and run xfs_repair");
return -EFSCORRUPTED;
}
/* copy everything from disk dquot to the incore dquot */
memcpy(&dqp->q_core, ddqp, sizeof(struct xfs_disk_dquot));
@ -544,6 +558,7 @@ xfs_dquot_from_disk(
/* initialize the dquot speculative prealloc thresholds */
xfs_dquot_set_prealloc_limits(dqp);
return 0;
}
/* Allocate and initialize the dquot buffer for this in-core dquot. */
@ -617,9 +632,11 @@ xfs_qm_dqread(
* further.
*/
ASSERT(xfs_buf_islocked(bp));
xfs_dquot_from_disk(dqp, bp);
error = xfs_dquot_from_disk(dqp, bp);
xfs_buf_relse(bp);
if (error)
goto err;
*dqpp = dqp;
return error;