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xfs: range check ri_cnt when recovering log items

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Range check the region counter when we're reassembling regions from log
items during log recovery.  In the old days ASSERT would halt the
kernel, but this isn't true any more so we have to make an explicit
error return.

Coverity-id: 1132508
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Darrick J. Wong 2019-11-06 09:11:23 -08:00
parent 120254608f
commit d6abecb825
1 changed files with 10 additions and 1 deletions
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11
fs/xfs/xfs_log_recover.c
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@ -4301,7 +4301,16 @@ xlog_recover_add_to_trans(
kmem_zalloc(item->ri_total * sizeof(xfs_log_iovec_t),
0);
}
ASSERT(item->ri_total > item->ri_cnt);
if (item->ri_total <= item->ri_cnt) {
xfs_warn(log->l_mp,
"log item region count (%d) overflowed size (%d)",
item->ri_cnt, item->ri_total);
ASSERT(0);
kmem_free(ptr);
return -EFSCORRUPTED;
}
/* Description region is ri_buf[0] */
item->ri_buf[item->ri_cnt].i_addr = ptr;
item->ri_buf[item->ri_cnt].i_len = len;