142 lines
4.5 KiB
Diff
142 lines
4.5 KiB
Diff
From 6a1580e84f492b5671d23be98192267bb73de250 Mon Sep 17 00:00:00 2001
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From: Marek Kasik <mkasik@redhat.com>
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Date: Mon, 13 May 2019 15:08:38 +0200
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Subject: [PATCH] Splash: Restrict filling of overlapping boxes
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Check whether area to fill in Splash::blitTransparent()
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does not run out of allocated memory for source and for destination
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and shrink it if needed.
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Fixes #750
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---
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splash/Splash.cc | 48 +++++++++++++++++++++++++++++++++---------------
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1 file changed, 33 insertions(+), 15 deletions(-)
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diff --git a/splash/Splash.cc b/splash/Splash.cc
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index 0a06f9c8..4ac163e4 100644
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--- a/splash/Splash.cc
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+++ b/splash/Splash.cc
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@@ -5853,7 +5853,7 @@ SplashError Splash::blitTransparent(SplashBitmap *src, int xSrc, int ySrc,
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int xDest, int yDest, int w, int h) {
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SplashColorPtr p, sp;
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Guchar *q;
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- int x, y, mask, srcMask;
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+ int x, y, mask, srcMask, width = w, height = h;
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if (src->mode != bitmap->mode) {
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return splashErrModeMismatch;
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@@ -5863,14 +5863,32 @@ SplashError Splash::blitTransparent(SplashBitmap *src, int xSrc, int ySrc,
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return splashErrZeroImage;
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}
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+ if (src->getWidth() - xSrc < width)
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+ width = src->getWidth() - xSrc;
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+
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+ if (src->getHeight() - ySrc < height)
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+ height = src->getHeight() - ySrc;
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+
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+ if (bitmap->getWidth() - xDest < width)
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+ width = bitmap->getWidth() - xDest;
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+
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+ if (bitmap->getHeight() - yDest < height)
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+ height = bitmap->getHeight() - yDest;
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+
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+ if (width < 0)
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+ width = 0;
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+
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+ if (height < 0)
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+ height = 0;
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+
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switch (bitmap->mode) {
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case splashModeMono1:
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- for (y = 0; y < h; ++y) {
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+ for (y = 0; y < height; ++y) {
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p = &bitmap->data[(yDest + y) * bitmap->rowSize + (xDest >> 3)];
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mask = 0x80 >> (xDest & 7);
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sp = &src->data[(ySrc + y) * src->rowSize + (xSrc >> 3)];
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srcMask = 0x80 >> (xSrc & 7);
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- for (x = 0; x < w; ++x) {
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+ for (x = 0; x < width; ++x) {
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if (*sp & srcMask) {
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*p |= mask;
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} else {
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@@ -5888,20 +5906,20 @@ SplashError Splash::blitTransparent(SplashBitmap *src, int xSrc, int ySrc,
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}
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break;
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case splashModeMono8:
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- for (y = 0; y < h; ++y) {
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+ for (y = 0; y < height; ++y) {
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p = &bitmap->data[(yDest + y) * bitmap->rowSize + xDest];
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sp = &src->data[(ySrc + y) * bitmap->rowSize + xSrc];
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- for (x = 0; x < w; ++x) {
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+ for (x = 0; x < width; ++x) {
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*p++ = *sp++;
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}
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}
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break;
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case splashModeRGB8:
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case splashModeBGR8:
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- for (y = 0; y < h; ++y) {
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+ for (y = 0; y < height; ++y) {
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p = &bitmap->data[(yDest + y) * bitmap->rowSize + 3 * xDest];
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sp = &src->data[(ySrc + y) * src->rowSize + 3 * xSrc];
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- for (x = 0; x < w; ++x) {
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+ for (x = 0; x < width; ++x) {
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*p++ = *sp++;
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*p++ = *sp++;
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*p++ = *sp++;
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@@ -5909,10 +5927,10 @@ SplashError Splash::blitTransparent(SplashBitmap *src, int xSrc, int ySrc,
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}
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break;
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case splashModeXBGR8:
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- for (y = 0; y < h; ++y) {
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+ for (y = 0; y < height; ++y) {
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p = &bitmap->data[(yDest + y) * bitmap->rowSize + 4 * xDest];
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sp = &src->data[(ySrc + y) * src->rowSize + 4 * xSrc];
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- for (x = 0; x < w; ++x) {
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+ for (x = 0; x < width; ++x) {
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*p++ = *sp++;
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*p++ = *sp++;
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*p++ = *sp++;
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@@ -5923,10 +5941,10 @@ SplashError Splash::blitTransparent(SplashBitmap *src, int xSrc, int ySrc,
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break;
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#ifdef SPLASH_CMYK
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case splashModeCMYK8:
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- for (y = 0; y < h; ++y) {
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+ for (y = 0; y < height; ++y) {
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p = &bitmap->data[(yDest + y) * bitmap->rowSize + 4 * xDest];
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sp = &src->data[(ySrc + y) * src->rowSize + 4 * xSrc];
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- for (x = 0; x < w; ++x) {
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+ for (x = 0; x < width; ++x) {
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*p++ = *sp++;
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*p++ = *sp++;
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*p++ = *sp++;
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@@ -5935,10 +5953,10 @@ SplashError Splash::blitTransparent(SplashBitmap *src, int xSrc, int ySrc,
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}
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break;
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case splashModeDeviceN8:
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- for (y = 0; y < h; ++y) {
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+ for (y = 0; y < height; ++y) {
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p = &bitmap->data[(yDest + y) * bitmap->rowSize + (SPOT_NCOMPS+4) * xDest];
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sp = &src->data[(ySrc + y) * src->rowSize + (SPOT_NCOMPS+4) * xSrc];
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- for (x = 0; x < w; ++x) {
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+ for (x = 0; x < width; ++x) {
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for (int cp=0; cp < SPOT_NCOMPS+4; cp++)
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*p++ = *sp++;
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}
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@@ -5948,9 +5966,9 @@ SplashError Splash::blitTransparent(SplashBitmap *src, int xSrc, int ySrc,
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}
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if (bitmap->alpha) {
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- for (y = 0; y < h; ++y) {
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+ for (y = 0; y < height; ++y) {
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q = &bitmap->alpha[(yDest + y) * bitmap->width + xDest];
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- memset(q, 0x00, w);
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+ memset(q, 0x00, width);
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}
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}
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--
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GitLab
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