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video-scaler: make sure to clamp to max width

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When estimating the area that should first be vertically scaled, make
sure we clamp to the max input size or else we get invalid reads.
This commit is contained in:
Wim Taymans 2015-06-12 16:52:27 +02:00
parent f4f3894836
commit 1fbbff491a
1 changed files with 11 additions and 4 deletions
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15
gst-libs/gst/video/video-scaler.c
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@ -1137,6 +1137,7 @@ gst_video_scaler_combine_packed_YUV (GstVideoScaler * y_scale,
scale->in_y_offset = get_y_offset (in_format);
scale->out_y_offset = get_y_offset (out_format);
scale->inc = y_scale->inc;
for (i = 0; i < out_size; i++) {
if ((i & 1) == scale->out_y_offset) {
@ -1498,24 +1499,30 @@ gst_video_scaler_2d (GstVideoScaler * hscale, GstVideoScaler * vscale,
vfunc (vscale, lines, LINE (dest, dest_stride, i), i, width, n_elems);
}
} else {
guint vx, vw, w1;
guint vx, vw, w1, ws;
guint h_taps;
h_taps = hscale->resampler.max_taps;
w1 = x + width - 1;
ws = hscale->resampler.offset[w1];
/* we need to estimate the area that we first need to scale in the
* vertical direction. Scale x and width to find the lower bound and
* overshoot the width to find the upper bound */
vx = (hscale->inc * x) >> 16;
vx = MIN (vx, hscale->resampler.offset[x]);
vw = (hscale->inc * (x + width)) >> 16;
if (hscale->merged) {
if ((w1 & 1) == hscale->out_y_offset)
vw = MAX (vw, hscale->resampler.offset[w1] + (2 * h_taps));
vw = MAX (vw, ws + (2 * h_taps));
else
vw = MAX (vw, hscale->resampler.offset[w1] + (4 * h_taps));
vw = MAX (vw, ws + (4 * h_taps));
} else {
vw = MAX (vw, hscale->resampler.offset[w1] + h_taps);
vw = MAX (vw, ws + h_taps);
}
vw += 1;
/* but clamp to max size */
vw = MIN (vw, hscale->resampler.in_size);
if (vscale->tmpwidth < vw)
realloc_tmplines (vscale, n_elems, vw);