avcodec/indeo2: Check remaining input more often
authorMichael Niedermayer <michael@niedermayer.cc>
Wed, 31 Jul 2019 22:50:21 +0000 (00:50 +0200)
committerMichael Niedermayer <michael@niedermayer.cc>
Tue, 13 Aug 2019 20:14:03 +0000 (22:14 +0200)
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@niedermayer.cc>
libavcodec/indeo2.c

index 09cb560..f367682 100644 (file)
@@ -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;