From: Matej Mužila <mmuz...@redhat.com>
Check if cpmsg->size is in limits of DATA_FRAGMENT
Signed-off-by: Matej Mužila <mmuz...@redhat.com>
Acked-by: K. Y. Srinivasan <k...@microsoft.com>
---
If corrupted data are read from /dev/vmbus/hv_fcopy, pwrite can
read from memory outside of the buffer (defined at line 138).
Added check.
---
@@ -104,6 +104,10 @@ static int hv_copy_data(struct hv_do_fcopy *cpmsg)
{
ssize_t bytes_written;
+ // Check if the cpmsg->size is in limits of DATA_FRAGMENT
+ if (cpmsg->size > DATA_FRAGMENT * sizeof(__u8))
+ return HV_E_FAIL;
+
bytes_written = pwrite(target_fd, cpmsg->data, cpmsg->size,
cpmsg->offset);
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