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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 <djwong@kernel.org>
This commit is contained in:
Darrick J. Wong 2023-02-14 17:51:35 -08:00
parent 571dc9ae4e
commit 60b730a40c
1 changed files with 1 additions and 0 deletions
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1
fs/xfs/xfs_fsmap.c
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@ -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]);