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[FFmpeg-devel,4/6] avformat/ifv: Check that total frames do not overflow

Message ID 20201017220842.17409-4-michael@niedermayer.cc
State Accepted
Headers show
Series [FFmpeg-devel,1/6] avformat/asfdec_f: Check for negative ext_len | expand

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Context Check Description
andriy/x86_make success Make finished
andriy/x86_make_fate success Make fate finished

Commit Message

Michael Niedermayer Oct. 17, 2020, 10:08 p.m. UTC 
Fixes: Infinite loop
Fixes: 26392/clusterfuzz-testcase-minimized-ffmpeg_dem_GIF_fuzzer-5713658237419520

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavformat/ifv.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)
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Patch

diff --git a/libavformat/ifv.c b/libavformat/ifv.c
index f95e9b0e52..4e904fa828 100644
--- a/libavformat/ifv.c
+++ b/libavformat/ifv.c
@@ -210,6 +210,7 @@  static int ifv_read_packet(AVFormatContext *s, AVPacket *pkt)
     }
 
     if (!ev) {
+        uint64_t vframes, aframes;
         if (ifv->is_audio_present && !ea) {
             /*read new video and audio indexes*/
 
@@ -217,8 +218,12 @@  static int ifv_read_packet(AVFormatContext *s, AVPacket *pkt)
             ifv->next_audio_index = ifv->total_aframes;
 
             avio_skip(s->pb, 0x1c);
-            ifv->total_vframes += avio_rl32(s->pb);
-            ifv->total_aframes += avio_rl32(s->pb);
+            vframes = ifv->total_vframes + (uint64_t)avio_rl32(s->pb);
+            aframes = ifv->total_aframes + (uint64_t)avio_rl32(s->pb);
+            if (vframes > INT_MAX || aframes > INT_MAX)
+                return AVERROR_INVALIDDATA;
+            ifv->total_vframes = vframes;
+            ifv->total_aframes = aframes;
             avio_skip(s->pb, 0xc);
 
             if (avio_feof(s->pb))
@@ -240,7 +245,10 @@  static int ifv_read_packet(AVFormatContext *s, AVPacket *pkt)
             ifv->next_video_index = ifv->total_vframes;
 
             avio_skip(s->pb, 0x1c);
-            ifv->total_vframes += avio_rl32(s->pb);
+            vframes = ifv->total_vframes + (uint64_t)avio_rl32(s->pb);
+            if (vframes > INT_MAX)
+                return AVERROR_INVALIDDATA;
+            ifv->total_vframes = vframes;
             avio_skip(s->pb, 0x10);
 
             if (avio_feof(s->pb))