diff options
| author | Darrick J. Wong <darrick.wong@oracle.com> | 2017-09-17 14:06:38 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-09-20 08:19:58 +0200 |
| commit | 01bc132048cf9505ed49152cc82e583b18c5538d (patch) | |
| tree | 8fcb15329670c500f92b99f555281b010e377dad | |
| parent | c32b1ec8a266476494f04843434538cdb25d9190 (diff) | |
xfs: check _alloc_read_agf buffer pointer before using
commit 10479e2dea83d4c421ad05dfc55d918aa8dfc0cd 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>
| -rw-r--r-- | fs/xfs/libxfs/xfs_refcount.c | 4 | ||||
| -rw-r--r-- | fs/xfs/xfs_reflink.c | 2 |
2 files changed, 6 insertions, 0 deletions
diff --git a/fs/xfs/libxfs/xfs_refcount.c b/fs/xfs/libxfs/xfs_refcount.c index e17016163542..d71cb63cdea3 100644 --- a/fs/xfs/libxfs/xfs_refcount.c +++ b/fs/xfs/libxfs/xfs_refcount.c @@ -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. */ diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c index 350fc64441b1..0015c19c7455 100644 --- a/fs/xfs/xfs_reflink.c +++ b/fs/xfs/xfs_reflink.c @@ -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); |