[FFmpeg-cvslog] avcodec/g2meet: Change order of operations to avoid undefined behavior

[Michael Niedermayer]

ffmpeg | branch: release/4.0 | Michael Niedermayer <michael at niedermayer.cc> | Fri May  4 18:16:08 2018 +0200| [2cffce26a7863e7909b0a52ef5465a4db247ab72] | committer: Michael Niedermayer

avcodec/g2meet: Change order of operations to avoid undefined behavior

Fixes: signed integer overflow: 65280 * 196032 cannot be represented in type 'int'
Fixes: 7279/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_G2M_fuzzer-5977332473921536

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 0a4745145840d97619c424961c1b5c625dbf516c)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=2cffce26a7863e7909b0a52ef5465a4db247ab72
---

 libavcodec/g2meet.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/libavcodec/g2meet.c b/libavcodec/g2meet.c
index b409dae813..5edfb31560 100644
--- a/libavcodec/g2meet.c
+++ b/libavcodec/g2meet.c
@@ -1356,14 +1356,16 @@ static void g2m_paint_cursor(G2MContext *c, uint8_t *dst, int stride)
     } else {
         dst    +=  x * 3;
     }
-    if (y < 0) {
+
+    if (y < 0)
         h      +=  y;
+    if (w < 0 || h < 0)
+        return;
+    if (y < 0) {
         cursor += -y * c->cursor_stride;
     } else {
         dst    +=  y * stride;
     }
-    if (w < 0 || h < 0)
-        return;
 
     for (j = 0; j < h; j++) {
         for (i = 0; i < w; i++) {