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jpegdec: Fix crash when interlaced field height is not DCT block size aligned

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In case of interlaced JPEG file, we are doubling stride.
The scratch scan line should take account of it as well.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/-/merge_requests/1042>
This commit is contained in:
Seungha Yang 2021-08-03 19:12:11 +09:00 committed by GStreamer Marge Bot
parent fedd6c2a28
commit 2c69544d0c
1 changed files with 8 additions and 3 deletions
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11
ext/jpeg/gstjpegdec.c
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@ -871,7 +871,7 @@ gst_jpeg_dec_decode_direct (GstJpegDec * dec, GstVideoFrame * frame,
gint lines, v_samp[3];
guchar *base[3], *last[3];
gint stride[3];
guint height;
guint height, field_height;
line[0] = y;
line[1] = u;
@ -884,7 +884,12 @@ gst_jpeg_dec_decode_direct (GstJpegDec * dec, GstVideoFrame * frame,
if (G_UNLIKELY (v_samp[0] > 2 || v_samp[1] > 2 || v_samp[2] > 2))
goto format_not_supported;
height = GST_VIDEO_FRAME_HEIGHT (frame);
height = field_height = GST_VIDEO_FRAME_HEIGHT (frame);
/* XXX: division by 2 here might not be a good idea yes. But we are doing this
* already in gst_jpeg_dec_handle_frame() for interlaced jpeg */
if (num_fields == 2)
field_height /= 2;
for (i = 0; i < 3; i++) {
base[i] = GST_VIDEO_FRAME_COMP_DATA (frame, i);
@ -899,7 +904,7 @@ gst_jpeg_dec_decode_direct (GstJpegDec * dec, GstVideoFrame * frame,
}
}
if (height % (v_samp[0] * DCTSIZE) && (dec->scratch_size < stride[0])) {
if (field_height % (v_samp[0] * DCTSIZE) && (dec->scratch_size < stride[0])) {
g_free (dec->scratch);
dec->scratch = g_malloc (stride[0]);
dec->scratch_size = stride[0];