Supply additional checks in order to prevent unexpected results.
Fixes: b892bf75b2034 ("ion: Switch ion to use dma-buf")
Suggested-by: Dan Carpenter <dan.carpen...@oracle.com>
Signed-off-by: Lee Jones <lee.jo...@linaro.org>
---
Destined for v4.4.y and v4.9.y
drivers/staging/android/ion/ion.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/staging/android/ion/ion.c
b/drivers/staging/android/ion/ion.c
index 806e9b30b9dc8..aac9b38b8c25c 100644
--- a/drivers/staging/android/ion/ion.c
+++ b/drivers/staging/android/ion/ion.c
@@ -489,6 +489,9 @@ static 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;
}
@@ -509,6 +512,9 @@ static void *ion_handle_kmap_get(struct ion_handle *handle)
void *vaddr;
if (handle->kmap_cnt) {
+ if (handle->kmap_cnt == INT_MAX)
+ return ERR_PTR(-EOVERFLOW);
+
handle->kmap_cnt++;
return buffer->vaddr;
}
--
2.34.0.rc2.393.gf8c9666880-goog
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