tree 7b95545601c687451e6a09f49b7e9f78b3be9a9e
parent dad73ef232034dd0f4f46bda90c74e8727d840cc
author Ken Chen <cken@google.com> 1596798265 +0800
committer Ken Chen <cken@google.com> 1596802783 +0800

Fix OOB read in DNS resolver

The remote server specifies resplen, the length of the response it
intends to send. anssiz represents the size of the destination buffer.
If the reported resplen is larger than the anssiz, the code correctly
only reads up to anssiz bytes, but returns resplen. so later functions
will access far out of bounds.

The fix ensures that the length of send_vc return does not exceed the
buffer size.

Bug: 161362564
Test: build, flash, boot
Test: atest netd_integration_test
Merged-In: Id4b5df1be4652e4623847b0b0bad0af65b80fdd5
Change-Id: Id4b5df1be4652e4623847b0b0bad0af65b80fdd5