avcodec/dds: Use ff_set_dimensions()

Fixes: signed integer overflow: 2082471995 * 36 cannot be represented in type 'int'
Fixes: 16025/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_DDS_fuzzer-5136663778426880

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavcodec/dds.c

@@ -613,6 +613,7 @@ static int dds_decode(AVCodecContext *avctx, void *data,
     AVFrame *frame = data;
     int mipmap;
     int ret;
+    int width, height;
 
     ff_texturedsp_init(&ctx->texdsp);
     bytestream2_init(gbc, avpkt->data, avpkt->size);
@@ -631,9 +632,9 @@ static int dds_decode(AVCodecContext *avctx, void *data,
 
     bytestream2_skip(gbc, 4); // flags
 
-    avctx->height = bytestream2_get_le32(gbc);
+    height = bytestream2_get_le32(gbc);
-    avctx->width  = bytestream2_get_le32(gbc);
+    width  = bytestream2_get_le32(gbc);
-    ret = av_image_check_size(avctx->width, avctx->height, 0, avctx);
+    ret = ff_set_dimensions(avctx, width, height);
     if (ret < 0) {
         av_log(avctx, AV_LOG_ERROR, "Invalid image size %dx%d.\n",
                avctx->width, avctx->height);