[FFmpeg-devel] [PATCH 1/2] avcodec/lcldec: Make PNG filter addressing match the code afterwards

[Michael Niedermayer]

Also update check accordingly

Fixes: tickets/10237/mszh_306_306_yuv422_nocompress.avi
Fixes: tickets/10237/mszh_306_306_yuv411_nocompress.avi

Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
---
 libavcodec/lcldec.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/libavcodec/lcldec.c b/libavcodec/lcldec.c
index ed78d9d570..1c93378c4c 100644
--- a/libavcodec/lcldec.c
+++ b/libavcodec/lcldec.c
@@ -231,16 +231,19 @@ static int decode_frame(AVCodecContext *avctx, AVFrame *frame,
             break;
         case COMP_MSZH_NOCOMP: {
             int bppx2;
+            int widtha = width;
             switch (c->imgtype) {
             case IMGTYPE_YUV111:
             case IMGTYPE_RGB24:
                 bppx2 = 6;
                 break;
             case IMGTYPE_YUV422:
+                widtha &= ~3;
             case IMGTYPE_YUV211:
                 bppx2 = 4;
                 break;
             case IMGTYPE_YUV411:
+                widtha &= ~3;
             case IMGTYPE_YUV420:
                 bppx2 = 3;
                 break;
@@ -248,7 +251,7 @@ static int decode_frame(AVCodecContext *avctx, AVFrame *frame,
                 bppx2 = 0; // will error out below
                 break;
             }
-            if (len < ((width * height * bppx2) >> 1))
+            if (len < ((widtha * height * bppx2) >> 1))
                 return AVERROR_INVALIDDATA;
             break;
         }
@@ -314,8 +317,8 @@ static int decode_frame(AVCodecContext *avctx, AVFrame *frame,
             }
             break;
         case IMGTYPE_YUV422:
+            pixel_ptr = 0;
             for (row = 0; row < height; row++) {
-                pixel_ptr = row * width * 2;
                 yq = uq = vq =0;
                 for (col = 0; col < width/4; col++) {
                     encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
@@ -331,8 +334,8 @@ static int decode_frame(AVCodecContext *avctx, AVFrame *frame,
             }
             break;
         case IMGTYPE_YUV411:
+            pixel_ptr = 0;
             for (row = 0; row < height; row++) {
-                pixel_ptr = row * width / 2 * 3;
                 yq = uq = vq =0;
                 for (col = 0; col < width/4; col++) {
                     encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
-- 
2.17.1