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xfs: fix kernel memory exposure problems

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commit bf9216f922612d2db7666aae01e65064da2ffb3a upstream.

Fix a memory exposure problems in inumbers where we allocate an array of
structures with holes, fail to zero the holes, then blindly copy the
kernel memory contents (junk and all) into userspace.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Darrick J. Wong 2017-04-03 12:22:39 -07:00 committed by Greg Kroah-Hartman
parent ca659e086f
commit 3890d83805
1 changed files with 1 additions and 1 deletions
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2
fs/xfs/xfs_itable.c
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@ -585,7 +585,7 @@ xfs_inumbers(
return error;
bcount = MIN(left, (int)(PAGE_SIZE / sizeof(*buffer)));
buffer = kmem_alloc(bcount * sizeof(*buffer), KM_SLEEP);
buffer = kmem_zalloc(bcount * sizeof(*buffer), KM_SLEEP);
do {
struct xfs_inobt_rec_incore r;
int stat;