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Better fix of heap buffer overflow, suggested in https://github.com/nothings/stb/issues/1296

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This commit is contained in:
Filip Sykala 2022-03-21 06:31:43 +01:00
parent bec8d5b31d
commit 350d062495
2 changed files with 4 additions and 4 deletions
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4
src/imgui/README.md
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@ -18,5 +18,5 @@ imstb_truetype.h modification:
Hot fix for open symbolic fonts on windows
62bdfe6f8d04b88e8bd511cd613be80c0baa7f55
Hot fix for prevent Heap buffer overflow on MAC
56758dcf8568d91b8a3ad50ccd4b137181ac9490
Hot fix for open curved fonts mainly on MAC
2148e49f75d82cb19dc6ec409fb7825296ed005c

4
src/imgui/imstb_truetype.h
View File

@ -1664,7 +1664,7 @@ static int stbtt__GetGlyphShapeTT(const stbtt_fontinfo *info, int glyph_index, s
n = 1+ttUSHORT(endPtsOfContours + numberOfContours*2-2);
m = n + 2*numberOfContours; // a loose bound on how many vertices we might need
vertices = (stbtt_vertex *) STBTT_malloc((m + 1) * sizeof(vertices[0]), info->userdata);
vertices = (stbtt_vertex *) STBTT_malloc(m * sizeof(vertices[0]), info->userdata);
if (vertices == 0)
return 0;
@ -1735,7 +1735,7 @@ static int stbtt__GetGlyphShapeTT(const stbtt_fontinfo *info, int glyph_index, s
// now start the new one
start_off = !(flags & 1);
if (start_off) {
if (start_off && (i + 1) < n) {
// if we start off with an off-curve point, then when we need to find a point on the curve
// where we can start, and we need to save some state for when we wraparound.
scx = x;