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修复：校验 V4L2 编码协商尺寸，避免送帧越界崩溃

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mofeng-git
2026-09-27 13:32:34 +08:00
parent f8fb64ad8c
commit 7e6dc91095
3 changed files with 46 additions and 0 deletions
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36
build/cross/patches/0001-v4l2-m2m-reject-undersized-encoder-format.patch Normal file
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@@ -0,0 +1,36 @@
--- a/libavcodec/v4l2_m2m_enc.c
+++ b/libavcodec/v4l2_m2m_enc.c
@@ -338,6 +338,7 @@
V4L2m2mPriv *priv = avctx->priv_data;
enum AVPixelFormat pix_fmt_output;
uint32_t v4l2_fmt_output;
+ unsigned int output_width, output_height;
int ret;
ret = ff_v4l2_m2m_create_context(priv, &s);
@@ -370,6 +371,25 @@
v4l2_fmt_output = output->format.fmt.pix_mp.pixelformat;
else
v4l2_fmt_output = output->format.fmt.pix.pixelformat;
+
+ /* Drivers may clamp the requested raw format to their supported size.
+ * The software-frame upload still uses avctx/frame dimensions, so a
+ * smaller negotiated format would overrun the mapped output buffers.
+ * Allow upward alignment, but reject frames that do not fit.
+ */
+ if (V4L2_TYPE_IS_MULTIPLANAR(output->type)) {
+ output_width = output->format.fmt.pix_mp.width;
+ output_height = output->format.fmt.pix_mp.height;
+ } else {
+ output_width = output->format.fmt.pix.width;
+ output_height = output->format.fmt.pix.height;
+ }
+ if (output_width < avctx->width || output_height < avctx->height) {
+ av_log(avctx, AV_LOG_ERROR,
+ "Encoder cannot fit requested %dx%d frame in negotiated %ux%u format\n",
+ avctx->width, avctx->height, output_width, output_height);
+ return AVERROR(EINVAL);
+ }
pix_fmt_output = ff_v4l2_format_v4l2_to_avfmt(v4l2_fmt_output, AV_CODEC_ID_RAWVIDEO);
if (pix_fmt_output != avctx->pix_fmt) {