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xfs: check _alloc_read_agf buffer pointer before using

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In some circumstances, _alloc_read_agf can return an error code of zero
but also a null AGF buffer pointer.  Check for this and jump out.

Fixes-coverity-id: 1415250
Fixes-coverity-id: 1415320
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
This commit is contained in:
Darrick J. Wong 2017-07-17 14:30:57 -07:00
parent 4c1a67bd36
commit 10479e2dea
2 changed files with 6 additions and 0 deletions
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4
fs/xfs/libxfs/xfs_refcount.c
View File

@ -1638,6 +1638,10 @@ xfs_refcount_recover_cow_leftovers(
error = xfs_alloc_read_agf(mp, tp, agno, 0, &agbp);
if (error)
goto out_trans;
if (!agbp) {
error = -ENOMEM;
goto out_trans;
}
cur = xfs_refcountbt_init_cursor(mp, tp, agbp, agno, NULL);
/* Find all the leftover CoW staging extents. */

2
fs/xfs/xfs_reflink.c
View File

@ -170,6 +170,8 @@ xfs_reflink_find_shared(
error = xfs_alloc_read_agf(mp, tp, agno, 0, &agbp);
if (error)
return error;
if (!agbp)
return -ENOMEM;
cur = xfs_refcountbt_init_cursor(mp, tp, agbp, agno, NULL);