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xfs: validate quota log items during log recovery 

Arkadiusz has seen really strange crashes in xfs_qm_dqcheck that
I can only explain by a log item being too smal to actually fit the
xfs_dqblk_t we're dereferencing all over xfs_qm_dqcheck.  So add
graceful checks for NULL or too small quota items to the log recovery
code.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Eric Sandeen <sandeen@sandeen.net>
This commit is contained in:
Christoph Hellwig 2009-06-08 15:33:21 +02:00 committed by Christoph Hellwig
parent e1696834e8
commit 0c5e1ce89f
1 changed files with 32 additions and 6 deletions
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38
fs/xfs/xfs_log_recover.c
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@ -1975,16 +1975,30 @@ xlog_recover_do_reg_buffer(
error = 0;
if (buf_f->blf_flags &
(XFS_BLI_UDQUOT_BUF|XFS_BLI_PDQUOT_BUF|XFS_BLI_GDQUOT_BUF)) {
if (item->ri_buf[i].i_addr == NULL) {
cmn_err(CE_ALERT,
"XFS: NULL dquot in %s.", __func__);
goto next;
}
if (item->ri_buf[i].i_len < sizeof(xfs_dqblk_t)) {
cmn_err(CE_ALERT,
"XFS: dquot too small (%d) in %s.",
item->ri_buf[i].i_len, __func__);
goto next;
}
error = xfs_qm_dqcheck((xfs_disk_dquot_t *)
item->ri_buf[i].i_addr,
-1, 0, XFS_QMOPT_DOWARN,
"dquot_buf_recover");
if (error)
goto next;
}
if (!error)
memcpy(xfs_buf_offset(bp,
(uint)bit << XFS_BLI_SHIFT), /* dest */
item->ri_buf[i].i_addr, /* source */
nbits<<XFS_BLI_SHIFT); /* length */
memcpy(xfs_buf_offset(bp,
(uint)bit << XFS_BLI_SHIFT), /* dest */
item->ri_buf[i].i_addr, /* source */
nbits<<XFS_BLI_SHIFT); /* length */
next:
i++;
bit += nbits;
}
@ -2615,7 +2629,19 @@ xlog_recover_do_dquot_trans(
return (0);
recddq = (xfs_disk_dquot_t *)item->ri_buf[1].i_addr;
ASSERT(recddq);
if (item->ri_buf[1].i_addr == NULL) {
cmn_err(CE_ALERT,
"XFS: NULL dquot in %s.", __func__);
return XFS_ERROR(EIO);
}
if (item->ri_buf[1].i_len < sizeof(xfs_dqblk_t)) {
cmn_err(CE_ALERT,
"XFS: dquot too small (%d) in %s.",
item->ri_buf[1].i_len, __func__);
return XFS_ERROR(EIO);
}
/*
* This type of quotas was turned off, so ignore this record.
*/