[FFmpeg-devel] [PATCH 2/4] avcodec/xwddec: Use ff_set_dimensions()

[Michael Niedermayer]

Fixes: OOM
Fixes: 8178/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_XWD_fuzzer-4844793342459904

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
---
 libavcodec/xwddec.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/libavcodec/xwddec.c b/libavcodec/xwddec.c
index 592c98dd4e..8c4358fd4c 100644
--- a/libavcodec/xwddec.c
+++ b/libavcodec/xwddec.c
@@ -39,6 +39,7 @@ static int xwd_decode_frame(AVCodecContext *avctx, void *data,
     uint32_t pixformat, pixdepth, bunit, bitorder, bpad;
     uint32_t rgb[3];
     uint8_t *ptr;
+    int width, height;
     GetByteContext gb;
 
     if (buf_size < XWD_HEADER_SIZE)
@@ -60,8 +61,8 @@ static int xwd_decode_frame(AVCodecContext *avctx, void *data,
 
     pixformat     = bytestream2_get_be32u(&gb);
     pixdepth      = bytestream2_get_be32u(&gb);
-    avctx->width  = bytestream2_get_be32u(&gb);
-    avctx->height = bytestream2_get_be32u(&gb);
+    width         = bytestream2_get_be32u(&gb);
+    height        = bytestream2_get_be32u(&gb);
     xoffset       = bytestream2_get_be32u(&gb);
     be            = bytestream2_get_be32u(&gb);
     bunit         = bytestream2_get_be32u(&gb);
@@ -77,6 +78,9 @@ static int xwd_decode_frame(AVCodecContext *avctx, void *data,
     ncolors       = bytestream2_get_be32u(&gb);
     bytestream2_skipu(&gb, header_size - (XWD_HEADER_SIZE - 20));
 
+    if ((ret = ff_set_dimensions(avctx, width, height)) < 0)
+        return ret;
+
     av_log(avctx, AV_LOG_DEBUG,
            "pixformat %"PRIu32", pixdepth %"PRIu32", bunit %"PRIu32", bitorder %"PRIu32", bpad %"PRIu32"\n",
            pixformat, pixdepth, bunit, bitorder, bpad);
-- 
2.17.1