This is a note to let you know that I've just added the patch titled
staging: ion: Prevent incorrect reference counting behavour
to the 4.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
staging-ion-prevent-incorrect-reference-counting-behavour.patch
and it can be found in the queue-4.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From lee.jones@xxxxxxxxxx Mon Apr 25 17:58:17 2022
From: Lee Jones <lee.jones@xxxxxxxxxx>
Date: Mon, 25 Apr 2022 16:51:54 +0100
Subject: staging: ion: Prevent incorrect reference counting behavour
To: lee.jones@xxxxxxxxxx
Cc: stable@xxxxxxxxxxxxxxx, Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Message-ID: <20220425155154.2742426-1-lee.jones@xxxxxxxxxx>
Supply additional check in order to prevent unexpected results.
Fixes: b892bf75b2034 ("ion: Switch ion to use dma-buf")
Suggested-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Signed-off-by: Lee Jones <lee.jones@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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
@@ -160,6 +160,9 @@ 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;
}
Patches currently in stable-queue which might be from lee.jones@xxxxxxxxxx are
queue-4.14/staging-ion-prevent-incorrect-reference-counting-behavour.patch
