[FFmpeg-cvslog] avcodec/indeo2: Check remaining input more often

[Michael Niedermayer]

ffmpeg | branch: release/4.2 | Michael Niedermayer <michael at niedermayer.cc> | Thu Aug  1 00:50:21 2019 +0200| [634f590061b5044cc1621dbd8e6ca80693ebd573] | committer: Michael Niedermayer

avcodec/indeo2: Check remaining input more often

Fixes: Timeout (95sec -> 30ms)
Fixes: 14765/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_INDEO2_fuzzer-5692455527120896

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpe
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 52939a2c5772ec00101d293695d0a96dcccf99d9)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=634f590061b5044cc1621dbd8e6ca80693ebd573
---

 libavcodec/indeo2.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/libavcodec/indeo2.c b/libavcodec/indeo2.c
index 09cb560d8e..f367682e61 100644
--- a/libavcodec/indeo2.c
+++ b/libavcodec/indeo2.c
@@ -79,10 +79,11 @@ static int ir2_decode_plane(Ir2Context *ctx, int width, int height, uint8_t *dst
 
     for (j = 1; j < height; j++) {
         out = 0;
-        if (get_bits_left(&ctx->gb) <= 0)
-            return AVERROR_INVALIDDATA;
         while (out < width) {
-            int c = ir2_get_code(&ctx->gb);
+            int c;
+            if (get_bits_left(&ctx->gb) <= 0)
+                return AVERROR_INVALIDDATA;
+            c = ir2_get_code(&ctx->gb);
             if (c >= 0x80) { /* we have a skip */
                 c -= 0x7F;
                 if (out + c*2 > width)
@@ -123,9 +124,9 @@ static int ir2_decode_plane_inter(Ir2Context *ctx, int width, int height, uint8_
 
     for (j = 0; j < height; j++) {
         out = 0;
-        if (get_bits_left(&ctx->gb) <= 0)
-            return AVERROR_INVALIDDATA;
         while (out < width) {
+            if (get_bits_left(&ctx->gb) <= 0)
+                return AVERROR_INVALIDDATA;
             c = ir2_get_code(&ctx->gb);
             if (c >= 0x80) { /* we have a skip */
                 c   -= 0x7F;