[FFmpeg-cvslog] avcodec/get_bits: Make sure the input bitstream with padding can be addressed

[Michael Niedermayer]

ffmpeg | branch: release/3.3 | Michael Niedermayer <michael at niedermayer.cc> | Sat Mar 24 01:38:53 2018 +0100| [899d40c17fefe7f7a0ba7f7a95ae61be81b6d0ad] | committer: Michael Niedermayer

avcodec/get_bits: Make sure the input bitstream with padding can be addressed

Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit e529fe7633762cb26a665fb6dee3be29b15285cc)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=899d40c17fefe7f7a0ba7f7a95ae61be81b6d0ad
---

 libavcodec/get_bits.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/libavcodec/get_bits.h b/libavcodec/get_bits.h
index 0c7f5ff0c6..d7cf286378 100644
--- a/libavcodec/get_bits.h
+++ b/libavcodec/get_bits.h
@@ -32,6 +32,7 @@
 #include "libavutil/intreadwrite.h"
 #include "libavutil/log.h"
 #include "libavutil/avassert.h"
+#include "avcodec.h"
 #include "mathops.h"
 #include "vlc.h"
 
@@ -428,7 +429,7 @@ static inline int init_get_bits(GetBitContext *s, const uint8_t *buffer,
     int buffer_size;
     int ret = 0;
 
-    if (bit_size >= INT_MAX - 7 || bit_size < 0 || !buffer) {
+    if (bit_size >= INT_MAX - FFMAX(7, AV_INPUT_BUFFER_PADDING_SIZE*8) || bit_size < 0 || !buffer) {
         bit_size    = 0;
         buffer      = NULL;
         ret         = AVERROR_INVALIDDATA;