linux-kernel - [PATCH 4.19 43/53] staging: ion: Prevent incorrect reference counting behavour

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Message-Id: <20220426081736.910195602@linuxfoundation.org>
Date:   Tue, 26 Apr 2022 10:21:23 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org, lee.jones@...aro.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        "stable@...r.kernel.org, Dan Carpenter" <dan.carpenter@...cle.com>,
        Dan Carpenter <dan.carpenter@...cle.com>
Subject: [PATCH 4.19 43/53] staging: ion: Prevent incorrect reference counting behavour


Supply additional check in order to prevent unexpected results.

Fixes: b892bf75b2034 ("ion: Switch ion to use dma-buf")
Suggested-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Lee Jones <lee.jones@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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
@@ -140,6 +140,9 @@ 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;
 	}