From: Darrick J. Wong Date: Wed, 15 Feb 2023 01:51:35 +0000 (-0800) Subject: xfs: fix uninitialized variable access X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=60b730a40c43fbcc034970d3e77eb0f25b8cc1cf;p=linux.git xfs: fix uninitialized variable access 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 --- diff --git a/fs/xfs/xfs_fsmap.c b/fs/xfs/xfs_fsmap.c index 120d284a03fe4..59e7d1a14b672 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]);