xfs: don't call xfs_da_shrink_inode with NULL bp

CVE-2018-13094

xfs_attr3_leaf_create may have errored out before instantiating a buffer,
for example if the blkno is out of range.  In that case there is no work
to do to remove it, and in fact xfs_da_shrink_inode will lead to an oops
if we try.

This also seems to fix a flaw where the original error from
xfs_attr3_leaf_create gets overwritten in the cleanup case, and it
removes a pointless assignment to bp which isn't used after this.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=199969
Reported-by: Xu, Wen <wen.xu@gatech.edu>
Tested-by: Xu, Wen <wen.xu@gatech.edu>
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
(cherry picked from commit bb3d48dcf86a97dc25fe9fc2c11938e19cb4399a)
Signed-off-by: Po-Hsu Lin <po-hsu.lin@canonical.com>
Acked-by: Colin Ian King <colin.king@canonical.com>
Acked-by: Aaron Ma <aaron.ma@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>

diff --git a/fs/xfs/libxfs/xfs_attr_leaf.c b/fs/xfs/libxfs/xfs_attr_leaf.c
index 601eaa36f1ada22e2213f9178bcb5cdb5868034d..9fe3a3e87497a9911075971fad893f03b75f8f66 100644 (file)
--- a/fs/xfs/libxfs/xfs_attr_leaf.c
+++ b/fs/xfs/libxfs/xfs_attr_leaf.c
@@ -784,9 +784,8 @@ xfs_attr_shortform_to_leaf(
        ASSERT(blkno == 0);
        error = xfs_attr3_leaf_create(args, blkno, &bp);
        if (error) {
-               error = xfs_da_shrink_inode(args, 0, bp);
-               bp = NULL;
-               if (error)
+               /* xfs_attr3_leaf_create may not have instantiated a block */
+               if (bp && (xfs_da_shrink_inode(args, 0, bp) != 0))
                        goto out;
                xfs_idata_realloc(dp, size, XFS_ATTR_FORK);     /* try to put */
                memcpy(ifp->if_u1.if_data, tmpbuffer, size);    /* it back */