[FFmpeg-cvslog] avcodec/get_bits: add assertion to limit ouptut value of get_bits

[Marton Balint]

ffmpeg | branch: master | Marton Balint <cus at passwd.hu> | Sun Feb 17 00:21:09 2019 +0100| [694d9d53685333771823285457bdd1ef1480eafc] | committer: Marton Balint

avcodec/get_bits: add assertion to limit ouptut value of get_bits

Should fix the following Coverity false positives:

Coverity CID #1415651.
Coverity CID #1420392.
Coverity CID #1420473.
Coverity CID #1433770.
Coverity CID #1435320.
Coverity CID #1439573.
Coverity CID #1439580.
Coverity CID #1439588.

Signed-off-by: Marton Balint <cus at passwd.hu>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=694d9d53685333771823285457bdd1ef1480eafc
---

 libavcodec/get_bits.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/libavcodec/get_bits.h b/libavcodec/get_bits.h
index 2e2adc29c2..c2f267186e 100644
--- a/libavcodec/get_bits.h
+++ b/libavcodec/get_bits.h
@@ -403,6 +403,7 @@ static inline unsigned int get_bits(GetBitContext *s, int n)
     LAST_SKIP_BITS(re, s, n);
     CLOSE_READER(re, s);
 #endif
+    av_assert2(tmp < UINT64_C(1) << n);
     return tmp;
 }