From 60b730a40c43fbcc034970d3e77eb0f25b8cc1cf Mon Sep 17 00:00:00 2001
From: "Darrick J. Wong" <djwong@kernel.org>
Date: Tue, 14 Feb 2023 17:51:35 -0800
Subject: [PATCH] xfs: fix uninitialized variable access
Git-commit: 60b730a40c43fbcc034970d3e77eb0f25b8cc1cf
Patch-mainline: v6.3-rc1
References: git-fixes
If the end position of a GETFSMAP query overlaps an allocated space and
we're using the free space info to generate fsmap info, the akeys
information gets fed into the fsmap formatter with bad results.
Zero-init the space.
Reported-by: syzbot+090ae72d552e6bd93cfe@syzkaller.appspotmail.com
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Acked-by: Anthony Iliopoulos <ailiop@suse.com>
---
fs/xfs/xfs_fsmap.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/fs/xfs/xfs_fsmap.c b/fs/xfs/xfs_fsmap.c
index 120d284a03fe..59e7d1a14b67 100644
--- a/fs/xfs/xfs_fsmap.c
+++ b/fs/xfs/xfs_fsmap.c
@@ -761,6 +761,7 @@ xfs_getfsmap_datadev_bnobt(
{
struct xfs_alloc_rec_incore akeys[2];
+ memset(akeys, 0, sizeof(akeys));
info->missing_owner = XFS_FMR_OWN_UNKNOWN;
return __xfs_getfsmap_datadev(tp, keys, info,
xfs_getfsmap_datadev_bnobt_query, &akeys[0]);
--
2.35.3