summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
-rw-r--r--net/sunrpc/auth_gss/gss_rpc_xdr.c32
1 files changed, 13 insertions, 19 deletions
diff --git a/net/sunrpc/auth_gss/gss_rpc_xdr.c b/net/sunrpc/auth_gss/gss_rpc_xdr.c
index 3c85d1c8a028..f5067b2e0a08 100644
--- a/net/sunrpc/auth_gss/gss_rpc_xdr.c
+++ b/net/sunrpc/auth_gss/gss_rpc_xdr.c
@@ -166,14 +166,14 @@ static int dummy_dec_opt_array(struct xdr_stream *xdr,
return 0;
}
-static int get_s32(void **p, void *max, s32 *res)
+static int get_s32(struct xdr_stream *xdr, s32 *res)
{
- void *base = *p;
- void *next = (void *)((char *)base + sizeof(s32));
- if (unlikely(next > max || next < base))
+ __be32 *p;
+
+ p = xdr_inline_decode(xdr, 4);
+ if (!p)
return -EINVAL;
- memcpy(res, base, sizeof(s32));
- *p = next;
+ memcpy(res, p, sizeof(s32));
return 0;
}
@@ -182,7 +182,6 @@ static int gssx_dec_linux_creds(struct xdr_stream *xdr,
{
u32 length;
__be32 *p;
- void *q, *end;
s32 tmp;
int N, i, err;
@@ -192,33 +191,28 @@ static int gssx_dec_linux_creds(struct xdr_stream *xdr,
length = be32_to_cpup(p);
- /* FIXME: we do not want to use the scratch buffer for this one
- * may need to use functions that allows us to access an io vector
- * directly */
- p = xdr_inline_decode(xdr, length);
- if (unlikely(p == NULL))
+ if (length > (3 + NGROUPS_MAX) * sizeof(u32))
return -ENOSPC;
- q = p;
- end = q + length;
-
/* uid */
- err = get_s32(&q, end, &tmp);
+ err = get_s32(xdr, &tmp);
if (err)
return err;
creds->cr_uid = make_kuid(&init_user_ns, tmp);
/* gid */
- err = get_s32(&q, end, &tmp);
+ err = get_s32(xdr, &tmp);
if (err)
return err;
creds->cr_gid = make_kgid(&init_user_ns, tmp);
/* number of additional gid's */
- err = get_s32(&q, end, &tmp);
+ err = get_s32(xdr, &tmp);
if (err)
return err;
N = tmp;
+ if ((3 + N) * sizeof(u32) != length)
+ return -EINVAL;
creds->cr_group_info = groups_alloc(N);
if (creds->cr_group_info == NULL)
return -ENOMEM;
@@ -226,7 +220,7 @@ static int gssx_dec_linux_creds(struct xdr_stream *xdr,
/* gid's */
for (i = 0; i < N; i++) {
kgid_t kgid;
- err = get_s32(&q, end, &tmp);
+ err = get_s32(xdr, &tmp);
if (err)
goto out_free_groups;
err = -EINVAL;