avfilter/vf_fieldhint: Reorder operation to prevent hypothetical integer overflow

Fixes CID1355110 Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
9 years ago · be96ebdcd7
parent 7ae4d574e8
commit be96ebdcd7
1 changed files with 2 additions and 2 deletions
--- a/libavfilter/vf_fieldhint.c
+++ b/libavfilter/vf_fieldhint.c
@ -174,8 +174,8 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)

    switch (s->mode) {
    case 0:
-        top    = s->frame[1 + tf - outlink->frame_count];
-        bottom = s->frame[1 + bf - outlink->frame_count];
+        top    = s->frame[tf - outlink->frame_count + 1];
+        bottom = s->frame[bf - outlink->frame_count + 1];
        break;
    case 1:
        top    = s->frame[1 + tf];