NFSv4: Replace the open coded decode_opaque_inline() with the new generic

Also ensure that we always check that the size of the decoded object
matches the expectation that it must be smaller than NFS4_OPAQUE_LIMIT.
This should be true for all the current users of decode_opaque_inline(),
including decode_ace(), decode_pathname(), decode_attr_fs_locations()
and decode_exchange_id().

Note that this allows us to get rid of a number of existing checks in
decode_exchange_id(),

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Reviewed-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

1 files changed, 8 insertions, 21 deletions

diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
index 5f0a6fcd0030..d10cc2a62dff 100644
--- a/fs/nfs/nfs4xdr.c
+++ b/fs/nfs/nfs4xdr.c
@@ -3050,20 +3050,15 @@ static void print_overflow_msg(const char *func, const struct xdr_stream *xdr)
 
 static int decode_opaque_inline(struct xdr_stream *xdr, unsigned int *len, char **string)
 {
-        __be32 *p;
-
-        p = xdr_inline_decode(xdr, 4);
-        if (unlikely(!p))
-                goto out_overflow;
-        *len = be32_to_cpup(p);
-        p = xdr_inline_decode(xdr, *len);
-        if (unlikely(!p))
-                goto out_overflow;
-        *string = (char *)p;
+        ssize_t ret = xdr_stream_decode_opaque_inline(xdr, (void **)string,
+                        NFS4_OPAQUE_LIMIT);
+        if (unlikely(ret < 0)) {
+                if (ret == -EBADMSG)
+                        print_overflow_msg(__func__, xdr);
+                return -EIO;
+        }
+        *len = ret;
         return 0;
-out_overflow:
-        print_overflow_msg(__func__, xdr);
-        return -EIO;
 }
 
 static int decode_compound_hdr(struct xdr_stream *xdr, struct compound_hdr *hdr)
@@ -5645,8 +5640,6 @@ static int decode_exchange_id(struct xdr_stream *xdr,
         status = decode_opaque_inline(xdr, &dummy, &dummy_str);
         if (unlikely(status))
                 return status;
-        if (unlikely(dummy > NFS4_OPAQUE_LIMIT))
-                return -EIO;
         memcpy(res->server_owner->major_id, dummy_str, dummy);
         res->server_owner->major_id_sz = dummy;
 
@@ -5654,8 +5647,6 @@ static int decode_exchange_id(struct xdr_stream *xdr,
         status = decode_opaque_inline(xdr, &dummy, &dummy_str);
         if (unlikely(status))
                 return status;
-        if (unlikely(dummy > NFS4_OPAQUE_LIMIT))
-                return -EIO;
         memcpy(res->server_scope->server_scope, dummy_str, dummy);
         res->server_scope->server_scope_sz = dummy;
 
@@ -5670,16 +5661,12 @@ static int decode_exchange_id(struct xdr_stream *xdr,
                 status = decode_opaque_inline(xdr, &dummy, &dummy_str);
                 if (unlikely(status))
                         return status;
-                if (unlikely(dummy > NFS4_OPAQUE_LIMIT))
-                        return -EIO;
                 memcpy(res->impl_id->domain, dummy_str, dummy);
 
                 /* nii_name */
                 status = decode_opaque_inline(xdr, &dummy, &dummy_str);
                 if (unlikely(status))
                         return status;
-                if (unlikely(dummy > NFS4_OPAQUE_LIMIT))
-                        return -EIO;
                 memcpy(res->impl_id->name, dummy_str, dummy);
 
                 /* nii_date */