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xfs: check _alloc_read_agf buffer pointer before using

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commit 10479e2dea upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Darrick J. Wong
2017-09-17 14:06:38 -07:00
committed by Greg Kroah-Hartman
parent c32b1ec8a2
commit 01bc132048
2 changed files with 6 additions and 0 deletions
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4
fs/xfs/libxfs/xfs_refcount.c
View File

@@ -1640,6 +1640,10 @@ 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

@@ -169,6 +169,8 @@ xfs_reflink_find_shared(
error = xfs_alloc_read_agf(mp, NULL, agno, 0, &agbp);
if (error)
return error;
if (!agbp)
return -ENOMEM;
cur = xfs_refcountbt_init_cursor(mp, NULL, agbp, agno, NULL);