From a2a0a99a70b02649250fe2c50ef9546f9e306d44 Mon Sep 17 00:00:00 2001
From: "Darrick J. Wong" <darrick.wong@oracle.com>
Date: Fri, 1 May 2020 17:37:09 -0400
Subject: [PATCH] xfs: xfs_dabuf_map should return ENOMEM when map allocation
 fails

Source kernel commit: faf8ee8476c19b30fd16079ad616b2b0f56eaff4

If the xfs_buf_map array allocation in xfs_dabuf_map fails for whatever
reason, we bail out with error code zero.  This will confuse callers, so
make sure that we return ENOMEM.  Allocation failure should never happen
with the small size of the array, but code defensively anyway.

Fixes: 45feef8f50b94d ("xfs: refactor xfs_dabuf_map")
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Signed-off-by: Eric Sandeen <sandeen@sandeen.net>
---
 libxfs/xfs_da_btree.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/libxfs/xfs_da_btree.c b/libxfs/xfs_da_btree.c
index d785312f..4e909caa 100644
--- a/libxfs/xfs_da_btree.c
+++ b/libxfs/xfs_da_btree.c
@@ -2518,8 +2518,10 @@ xfs_dabuf_map(
 	 */
 	if (nirecs > 1) {
 		map = kmem_zalloc(nirecs * sizeof(struct xfs_buf_map), KM_NOFS);
-		if (!map)
+		if (!map) {
+			error = -ENOMEM;
 			goto out_free_irecs;
+		}
 		*mapp = map;
 	}
 
-- 
2.27.0

