nfs: check for integer overflow in decode_devicenotify_args()
On 32 bit, if n is too large then "n * sizeof(*args->devs)" could
overflow and args->devs would be smaller than expected.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/callback_xdr.c b/fs/nfs/callback_xdr.c
index 726e59a..d50b274 100644
--- a/fs/nfs/callback_xdr.c
+++ b/fs/nfs/callback_xdr.c
@@ -305,6 +305,10 @@
n = ntohl(*p++);
if (n <= 0)
goto out;
+ if (n > ULONG_MAX / sizeof(*args->devs)) {
+ status = htonl(NFS4ERR_BADXDR);
+ goto out;
+ }
args->devs = kmalloc(n * sizeof(*args->devs), GFP_KERNEL);
if (!args->devs) {