iSAC float: Handle errors in upper band decoding

iSAC float: Handle errors in upper band decoding

We hit a fuzzer bug that caused numDecodedBytesLB + numDecodedBytesUB
> lenEncodedBytes, which is obviously bogus. Check for that, and for
the case whhere the UB decoder itself realized that something was
wrong. (The code already makes the corresponding check for the LB
decoder.)

BUG=chromium:637899
Committed: https://crrev.com/d52bef7d6445070532b3c8463859ee4e1f99d70f
Cr-Commit-Position: refs/heads/master@{#14091}

[kwiberg-webrtc, 2016-09-06 12:00:57]

kwiberg@webrtc.org changed reviewers:
+ henrik.lundin@webrtc.org

[hlundin-webrtc, 2016-09-06 13:02:25]

lgtm

[kwiberg-webrtc, 2016-09-06 13:08:23]

The CQ bit was checked by kwiberg@webrtc.org

[commit-bot: I haz the power, 2016-09-06 13:08:31]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.webrtc.org/...

[commit-bot: I haz the power, 2016-09-06 13:16:06]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-09-06 13:16:15]

Description was changed from

==========
iSAC float: Handle errors in upper band decoding

We hit a fuzzer bug that caused numDecodedBytesLB + numDecodedBytesUB
> lenEncodedBytes, which is obviously bogus. Check for that, and for
the case whhere the UB decoder itself realized that something was
wrong. (The code already makes the corresponding check for the LB
decoder.)

BUG=chromium:637899
==========

to

==========
iSAC float: Handle errors in upper band decoding

We hit a fuzzer bug that caused numDecodedBytesLB + numDecodedBytesUB
> lenEncodedBytes, which is obviously bogus. Check for that, and for
the case whhere the UB decoder itself realized that something was
wrong. (The code already makes the corresponding check for the LB
decoder.)

BUG=chromium:637899

Committed: https://crrev.com/d52bef7d6445070532b3c8463859ee4e1f99d70f
Cr-Commit-Position: refs/heads/master@{#14091}
==========

[commit-bot: I haz the power, 2016-09-06 13:16:16]

Patchset 1 (id:??) landed as
https://crrev.com/d52bef7d6445070532b3c8463859ee4e1f99d70f
Cr-Commit-Position: refs/heads/master@{#14091}