[FFmpeg-cvslog] avcodec/gifdec: truncate too big width/height for invalid gif files

[Paul B Mahol]

ffmpeg | branch: master | Paul B Mahol <onemda at gmail.com> | Mon Dec 10 13:32:10 2018 +0100| [8affd753c86d7e2ddefd24beafe4e892914c63bc] | committer: Paul B Mahol

avcodec/gifdec: truncate too big width/height for invalid gif files

Fixes #6874.

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=8affd753c86d7e2ddefd24beafe4e892914c63bc
---

 libavcodec/gifdec.c | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/libavcodec/gifdec.c b/libavcodec/gifdec.c
index 54f1d4c0ba..2115da163f 100644
--- a/libavcodec/gifdec.c
+++ b/libavcodec/gifdec.c
@@ -179,12 +179,20 @@ static int gif_read_image(GifState *s, AVFrame *frame)
     }
 
     /* verify that all the image is inside the screen dimensions */
-    if (!width || width > s->screen_width || left >= s->screen_width) {
-        av_log(s->avctx, AV_LOG_ERROR, "Invalid image width.\n");
+    if (!width || width > s->screen_width) {
+        av_log(s->avctx, AV_LOG_WARNING, "Invalid image width: %d, truncating.\n", width);
+        width = s->screen_width;
+    }
+    if (left >= s->screen_width) {
+        av_log(s->avctx, AV_LOG_ERROR, "Invalid left position: %d.\n", left);
         return AVERROR_INVALIDDATA;
     }
-    if (!height || height > s->screen_height || top >= s->screen_height) {
-        av_log(s->avctx, AV_LOG_ERROR, "Invalid image height.\n");
+    if (!height || height > s->screen_height) {
+        av_log(s->avctx, AV_LOG_WARNING, "Invalid image height: %d, truncating.\n", height);
+        height = s->screen_height;
+    }
+    if (top >= s->screen_height) {
+        av_log(s->avctx, AV_LOG_ERROR, "Invalid top position: %d.\n", top);
         return AVERROR_INVALIDDATA;
     }
     if (left + width > s->screen_width) {