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dwrite: Fix invalid read when building zero length text layout (Valgrind). 

Signed-off-by: Nikolay Sivov <nsivov@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Nikolay Sivov 2016-06-13 16:38:27 +03:00 committed by Alexandre Julliard
parent 6ea86fae55
commit f1079fe162
1 changed files with 3 additions and 2 deletions
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5
dlls/dwrite/layout.c
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@ -727,7 +727,7 @@ static HRESULT layout_compute_runs(struct dwrite_textlayout *layout)
free_layout_runs(layout);
/* Cluster data arrays are allocated once, assuming one text position per cluster. */
if (!layout->clustermetrics) {
if (!layout->clustermetrics && layout->len) {
layout->clustermetrics = heap_alloc(layout->len*sizeof(*layout->clustermetrics));
layout->clusters = heap_alloc(layout->len*sizeof(*layout->clusters));
if (!layout->clustermetrics || !layout->clusters) {
@ -1694,12 +1694,13 @@ static HRESULT layout_compute_effective_runs(struct dwrite_textlayout *layout)
layout->metrics.lineCount = 0;
origin_x = is_rtl ? layout->metrics.layoutWidth : 0.0f;
line = 0;
run = layout->clusters[0].run;
memset(&metrics, 0, sizeof(metrics));
layout_splitting_params_from_pos(layout, 0, &params);
prev_params = params;
if (layout->cluster_count)
run = layout->clusters[0].run;
for (i = 0, start = 0, textpos = 0, width = 0.0f; i < layout->cluster_count; i++) {
BOOL overflow;