[PATCH 1/2] libxfs: don't send null bp to xfs_trans_brelse()

[Eric Sandeen]

In this case, if bp is null, error is set, and we send
bp to xfs_trans_brelse, which will try to dereference it.

Test whether we actualy have a buffer before we try to
free it.

Same fix as was sent for kernelspace.

Coverity spotted this.

Signed-off-by: Eric Sandeen <sandeen at redhat.com>
---
 libxfs/xfs_da_btree.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/libxfs/xfs_da_btree.c b/libxfs/xfs_da_btree.c
index b70454e..b731b54 100644
--- a/libxfs/xfs_da_btree.c
+++ b/libxfs/xfs_da_btree.c
@@ -2582,7 +2582,8 @@ xfs_da_get_buf(
 				    mapp, nmap, 0);
 	error = bp ? bp->b_error : XFS_ERROR(EIO);
 	if (error) {
-		xfs_trans_brelse(trans, bp);
+		if (bp)
+			xfs_trans_brelse(trans, bp);
 		goto out_free;
 	}
 
-- 
1.7.1