android/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

BACKPORT: staging: ion: Prevent incorrect reference counting behavour

Browse Source 
Supply additional check in order to prevent unexpected results.

Bug: 205573273
Fixes: b892bf75b2 ("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>
[Lee: Patch now applies to ion_buffer.c instead of ion.c]
Change-Id: Ia6afdd9ca502caa9cad6619d438fc6c8e8457679
(cherry picked from commit fea24b07ed)
This commit is contained in:
Lee Jones 2022-05-09 15:17:10 +01:00
parent 1e037dd790
commit 0d752f78b2
1 changed files with 3 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/staging/android/ion/ion_buffer.c
View File

@ -249,6 +249,9 @@ void *ion_buffer_kmap_get(struct ion_buffer *buffer)
void *vaddr;
if (buffer->kmap_cnt) {
if (buffer->kmap_cnt == INT_MAX)
return ERR_PTR(-EOVERFLOW);
buffer->kmap_cnt++;
return buffer->vaddr;
}