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[FFmpeg-devel,1/2] avcodec/cfhd: Check that cropped size is smaller than full

Message ID 20190829190459.5171-1-michael@niedermayer.cc
State Accepted
Commit 9fac243744c6c0ce2a2cf23550bc48b736661379
Headers show

Commit Message

Michael Niedermayer Aug. 29, 2019, 7:04 p.m. UTC 
Fixes: signed integer overflow: 57342 * 120830 cannot be represented in type 'int'
Fixes: 16426/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_CFHD_fuzzer-5758744817827840

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
---
 libavcodec/cfhd.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

Comments

Michael Niedermayer Sept. 15, 2019, 10:24 p.m. UTC | #1 
On Thu, Aug 29, 2019 at 09:04:58PM +0200, Michael Niedermayer wrote:
> Fixes: signed integer overflow: 57342 * 120830 cannot be represented in type 'int'
> Fixes: 16426/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_CFHD_fuzzer-5758744817827840
> 
> Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
> ---
>  libavcodec/cfhd.c | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)

will apply

[...]
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Patch

diff --git a/libavcodec/cfhd.c b/libavcodec/cfhd.c
index 27eed415d1..b4d6b25cbc 100644
--- a/libavcodec/cfhd.c
+++ b/libavcodec/cfhd.c
@@ -625,8 +625,12 @@  static int cfhd_decode(AVCodecContext *avctx, void *data, int *got_frame,
             ret = ff_set_dimensions(avctx, s->coded_width, s->coded_height);
             if (ret < 0)
                 return ret;
-            if (s->cropped_height)
-                avctx->height = s->cropped_height << (avctx->pix_fmt == AV_PIX_FMT_BAYER_RGGB16);
+            if (s->cropped_height) {
+                unsigned height = s->cropped_height << (avctx->pix_fmt == AV_PIX_FMT_BAYER_RGGB16);
+                if (avctx->height < height)
+                    return AVERROR_INVALIDDATA;
+                avctx->height = height;
+            }
             frame.f->width =
             frame.f->height = 0;