releases/5.4.191/staging-ion-prevent-incorrect-reference-counting-behavour.patch

From lee.jones@linaro.org  Mon Apr 25 17:58:17 2022
From: Lee Jones <lee.jones@linaro.org>
Date: Mon, 25 Apr 2022 16:51:54 +0100
Subject: staging: ion: Prevent incorrect reference counting behavour
To: lee.jones@linaro.org
Cc: stable@vger.kernel.org, Dan Carpenter <dan.carpenter@oracle.com>
Message-ID: <20220425155154.2742426-1-lee.jones@linaro.org>


Supply additional check in order to prevent unexpected results.

Fixes: b892bf75b2034 ("ion: Switch ion to use dma-buf")
Suggested-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/staging/android/ion/ion.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/staging/android/ion/ion.c
+++ b/drivers/staging/android/ion/ion.c
@@ -114,6 +114,9 @@ static void *ion_buffer_kmap_get(struct
 	void *vaddr;
 
 	if (buffer->kmap_cnt) {
+		if (buffer->kmap_cnt == INT_MAX)
+			return ERR_PTR(-EOVERFLOW);
+
 		buffer->kmap_cnt++;
 		return buffer->vaddr;
 	}