nfsd: encoders mustn't use unitialized values in error cases

In error cases, lgp->lg_layout_type may be out of bounds; so we
shouldn't be using it until after the check of nfserr.

This was seen to crash nfsd threads when the server receives a LAYOUTGET
request with a large layout type.

GETDEVICEINFO has the same problem.

Reported-by: Ari Kauppi <Ari.Kauppi@synopsys.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Cc: stable@vger.kernel.org
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
(cherry picked from commit f961e3f2acae94b727380c0b74e2d3954d0edf79)

Orabug: 26376568
CVE: CVE-2017-8797

Signed-off-by: Kirtikar Kashyap <kirtikar.kashyap@oracle.com>
Reviewed-by: Jack Vogel <jack.vogel@oracle.com>

diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index a9454dcfdd356566c42bf4ed5a7c0b0decfce6ca..137027dd2662e9f91c2042691f3327e4e1bb9877 100644 (file)
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -4021,8 +4021,7 @@ nfsd4_encode_getdeviceinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
                struct nfsd4_getdeviceinfo *gdev)
 {
        struct xdr_stream *xdr = &resp->xdr;
-       const struct nfsd4_layout_ops *ops =
-               nfsd4_layout_ops[gdev->gd_layout_type];
+       const struct nfsd4_layout_ops *ops;
        u32 starting_len = xdr->buf->len, needed_len;
        __be32 *p;
 
@@ -4039,6 +4038,7 @@ nfsd4_encode_getdeviceinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
 
        /* If maxcount is 0 then just update notifications */
        if (gdev->gd_maxcount != 0) {
+               ops = nfsd4_layout_ops[gdev->gd_layout_type];
                nfserr = ops->encode_getdeviceinfo(xdr, gdev);
                if (nfserr) {
                        /*
@@ -4091,8 +4091,7 @@ nfsd4_encode_layoutget(struct nfsd4_compoundres *resp, __be32 nfserr,
                struct nfsd4_layoutget *lgp)
 {
        struct xdr_stream *xdr = &resp->xdr;
-       const struct nfsd4_layout_ops *ops =
-               nfsd4_layout_ops[lgp->lg_layout_type];
+       const struct nfsd4_layout_ops *ops;
        __be32 *p;
 
        dprintk("%s: err %d\n", __func__, nfserr);
@@ -4115,6 +4114,7 @@ nfsd4_encode_layoutget(struct nfsd4_compoundres *resp, __be32 nfserr,
        *p++ = cpu_to_be32(lgp->lg_seg.iomode);
        *p++ = cpu_to_be32(lgp->lg_layout_type);
 
+       ops = nfsd4_layout_ops[lgp->lg_layout_type];
        nfserr = ops->encode_layoutget(xdr, lgp);
 out:
        kfree(lgp->lg_content);