Johann 240f8e56e4 vp9: Fix potential SEGV in decoder_peek_si_internal
decoder_peek_si_internal could potentially read more bytes than
what actually exists in the input buffer. We check for the buffer
size to be at least 8, but we try to read up to 10 bytes in the
worst case. A well crafted file could thus cause a segfault.
Likely change that introduced this bug was:
https://chromium-review.googlesource.com/#/c/70439 (git hash:
7c43fb6)

BUG=chromium:621095

(cherry picked from commit aa1c813c43c6b2e43036d5573f361924195d65b7)

Change-Id: Id74880cfdded44caaa45bbdbaac859c09d3db752
2016-06-28 16:40:03 -07:00
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