diff --git a/drivers/misc/mei/amthif.c b/drivers/misc/mei/amthif.c
index cd0403f0926761ec7253c53e399844198728a3ea..b753df98b4763922fbefaf377db60b55c4ce3291 100644
--- a/drivers/misc/mei/amthif.c
+++ b/drivers/misc/mei/amthif.c
@@ -195,9 +195,8 @@ int mei_amthif_read(struct mei_device *dev, struct file *file,
 		 * remove message from deletion list
 		 */
 
-	dev_dbg(dev->dev, "amthif cb->buf size - %d\n",
-	    cb->buf.size);
-	dev_dbg(dev->dev, "amthif cb->buf_idx - %lu\n", cb->buf_idx);
+	dev_dbg(dev->dev, "amthif cb->buf.size - %zd cb->buf_idx - %zd\n",
+		cb->buf.size, cb->buf_idx);
 
 	/* length is being truncated to PAGE_SIZE, however,
 	 * the buf_idx may point beyond */
diff --git a/drivers/misc/mei/client.c b/drivers/misc/mei/client.c
index e069fcaed7aaa08ca7479732a13be59eab244481..738f3d7033233418ad7f2d69f01f65e3a362eddd 100644
--- a/drivers/misc/mei/client.c
+++ b/drivers/misc/mei/client.c
@@ -1569,7 +1569,7 @@ int mei_cl_irq_write(struct mei_cl *cl, struct mei_cl_cb *cb,
 		return 0;
 	}
 
-	cl_dbg(dev, cl, "buf: size = %d idx = %lu\n",
+	cl_dbg(dev, cl, "buf: size = %zd idx = %zd\n",
 			cb->buf.size, cb->buf_idx);
 
 	rets = mei_write_message(dev, &mei_hdr, buf->data + cb->buf_idx);
diff --git a/drivers/misc/mei/interrupt.c b/drivers/misc/mei/interrupt.c
index 6340dee33052180c98e8803dfe8ae876f7b33e5d..b8aa047ec2585d967d8888fee3e08d361a5018e6 100644
--- a/drivers/misc/mei/interrupt.c
+++ b/drivers/misc/mei/interrupt.c
@@ -104,6 +104,7 @@ int mei_cl_irq_read_msg(struct mei_cl *cl,
 	struct mei_device *dev = cl->dev;
 	struct mei_cl_cb *cb;
 	unsigned char *buffer = NULL;
+	size_t buf_sz;
 
 	cb = list_first_entry_or_null(&cl->rd_pending, struct mei_cl_cb, list);
 	if (!cb) {
@@ -124,11 +125,21 @@ int mei_cl_irq_read_msg(struct mei_cl *cl,
 		goto out;
 	}
 
-	if (cb->buf.size < mei_hdr->length + cb->buf_idx) {
-		cl_dbg(dev, cl, "message overflow. size %d len %d idx %ld\n",
+	buf_sz = mei_hdr->length + cb->buf_idx;
+	/* catch for integer overflow */
+	if (buf_sz < cb->buf_idx) {
+		cl_err(dev, cl, "message is too big len %d idx %ld\n",
+		       mei_hdr->length, cb->buf_idx);
+
+		list_move_tail(&cb->list, &complete_list->list);
+		cb->status = -EMSGSIZE;
+		goto out;
+	}
+
+	if (cb->buf.size < buf_sz) {
+		cl_dbg(dev, cl, "message overflow. size %zd len %d idx %zd\n",
 			cb->buf.size, mei_hdr->length, cb->buf_idx);
-		buffer = krealloc(cb->buf.data, mei_hdr->length + cb->buf_idx,
-				  GFP_KERNEL);
+		buffer = krealloc(cb->buf.data, buf_sz, GFP_KERNEL);
 
 		if (!buffer) {
 			cb->status = -ENOMEM;
@@ -136,7 +147,7 @@ int mei_cl_irq_read_msg(struct mei_cl *cl,
 			goto out;
 		}
 		cb->buf.data = buffer;
-		cb->buf.size = mei_hdr->length + cb->buf_idx;
+		cb->buf.size = buf_sz;
 	}
 
 	buffer = cb->buf.data + cb->buf_idx;
diff --git a/drivers/misc/mei/main.c b/drivers/misc/mei/main.c
index 36ca15234344aad8b415c1732edd3052000657d6..47dc6d9ae6554885e5459f9ebe750838546cc24d 100644
--- a/drivers/misc/mei/main.c
+++ b/drivers/misc/mei/main.c
@@ -226,7 +226,7 @@ static ssize_t mei_read(struct file *file, char __user *ubuf,
 		goto free;
 	}
 
-	cl_dbg(dev, cl, "buf.size = %d buf.idx = %ld offset = %lld\n",
+	cl_dbg(dev, cl, "buf.size = %zd buf.idx = %zd offset = %lld\n",
 	       cb->buf.size, cb->buf_idx, *offset);
 	if (*offset >= cb->buf_idx) {
 		rets = 0;
@@ -245,7 +245,8 @@ static ssize_t mei_read(struct file *file, char __user *ubuf,
 
 	rets = length;
 	*offset += length;
-	if ((unsigned long)*offset < cb->buf_idx)
+	/* not all data was read, keep the cb */
+	if (*offset < cb->buf_idx)
 		goto out;
 
 free:
diff --git a/drivers/misc/mei/mei_dev.h b/drivers/misc/mei/mei_dev.h
index da613268480c67917cfca25a1ffece3d700f1a3c..9b793f87b7d471d8a1b974639edf9b505412794e 100644
--- a/drivers/misc/mei/mei_dev.h
+++ b/drivers/misc/mei/mei_dev.h
@@ -126,7 +126,7 @@ enum mei_cb_file_ops {
  * Intel MEI message data struct
  */
 struct mei_msg_data {
-	u32 size;
+	size_t size;
 	unsigned char *data;
 };
 
@@ -190,7 +190,7 @@ struct mei_cl_cb {
 	struct mei_cl *cl;
 	enum mei_cb_file_ops fop_type;
 	struct mei_msg_data buf;
-	unsigned long buf_idx;
+	size_t buf_idx;
 	unsigned long read_time;
 	struct file *file_object;
 	int status;