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staging: ion: Prevent incorrect reference counting behavour

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Supply additional checks 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>
This commit is contained in:
Lee Jones 2021-11-26 10:33:35 +00:00 committed by Greg Kroah-Hartman
parent 5fd8594b3c
commit 16b34e53ea
1 changed files with 6 additions and 0 deletions
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6
drivers/staging/android/ion/ion.c
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@ -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;
}