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[FFmpeg-devel,4/4] avcodec/prosumer: Error out if decompress() stops reading data

Message ID 20190112222803.11581-4-michael@niedermayer.cc
State Accepted
Commit 62f8d27ef1995354d6529ea0d9428501d7f914b4
Headers show

Commit Message

Michael Niedermayer Jan. 12, 2019, 10:28 p.m. UTC
if 0 is encountered in the LUT then decompress() will continue to output 0 bytes but never read more data.
Without a specification it is impossible to say if this is invalid or a feature.
None of the valid prosumer files tested cause a 0 to be read, so it is likely
not a intended feature.

Fixes: Timeout
Fixes: 11266/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_PROSUMER_fuzzer-5681827423977472

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavcodec/prosumer.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)
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Patch

diff --git a/libavcodec/prosumer.c b/libavcodec/prosumer.c
index 9143bb1bf4..ce3cbdbb73 100644
--- a/libavcodec/prosumer.c
+++ b/libavcodec/prosumer.c
@@ -96,6 +96,8 @@  static int decompress(GetByteContext *gb, int size, PutByteContext *pb, const ui
             }
             idx = a >> 20;
             b = lut[2 * idx];
+            if (!b)
+                return AVERROR_INVALIDDATA;
             continue;
         }
         idx = 2;
@@ -154,8 +156,9 @@  static int decode_frame(AVCodecContext *avctx, void *data,
     memset(s->decbuffer, 0, s->size);
     bytestream2_init(&s->gb, avpkt->data, avpkt->size);
     bytestream2_init_writer(&s->pb, s->decbuffer, s->size);
-
-    decompress(&s->gb, AV_RL32(avpkt->data + 28) >> 1, &s->pb, s->lut);
+    ret = decompress(&s->gb, AV_RL32(avpkt->data + 28) >> 1, &s->pb, s->lut);
+    if (ret < 0)
+        return ret;
     vertical_predict((uint32_t *)s->decbuffer, 0, (uint32_t *)s->initial_line, s->stride, 1);
     vertical_predict((uint32_t *)s->decbuffer, s->stride, (uint32_t *)s->decbuffer, s->stride, avctx->height - 1);