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authorcoadde [Márcio Alexandre Silva Delgado] <coadde@parabola.nu>2014-07-25 22:13:33 -0300
committercoadde [Márcio Alexandre Silva Delgado] <coadde@parabola.nu>2014-07-25 22:13:33 -0300
commit05252aac0bc2527999c83d69e71fb327ddb00099 (patch)
tree710db2e69c7a24ef74c1c7ba82f6e257b35fad64 /libre/xorg-server-libre/CVE-2013-6424.diff
parent95af5f97c59c2c43cb06f4f9e37612a2970ca61d (diff)
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add xorg-server-libre to libre repo
Diffstat (limited to 'libre/xorg-server-libre/CVE-2013-6424.diff')
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diff --git a/libre/xorg-server-libre/CVE-2013-6424.diff b/libre/xorg-server-libre/CVE-2013-6424.diff
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+From patchwork Wed Oct 2 13:47:54 2013
+Content-Type: text/plain; charset="utf-8"
+MIME-Version: 1.0
+Content-Transfer-Encoding: 7bit
+Subject: exa: only draw valid trapezoids
+From: Maarten Lankhorst <maarten.lankhorst@canonical.com>
+X-Patchwork-Id: 14769
+Message-Id: <524C240A.9010607@canonical.com>
+To: "X.Org Devel List" <xorg-devel@lists.freedesktop.org>
+Date: Wed, 02 Oct 2013 15:47:54 +0200
+
+Fixes freedesktop.org bug https://bugs.freedesktop.org/show_bug.cgi?id=67484
+
+If t->bottom is close to MIN_INT, removing top can wraparound, so do the check properly.
+A similar fix should also be applied to pixman.
+
+Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
+
+---
+
+
+diff --git a/exa/exa_render.c b/exa/exa_render.c
+index 172e2b5..807eeba 100644
+--- a/exa/exa_render.c
++++ b/exa/exa_render.c
+@@ -1141,7 +1141,8 @@ exaTrapezoids(CARD8 op, PicturePtr pSrc, PicturePtr pDst,
+
+ exaPrepareAccess(pPicture->pDrawable, EXA_PREPARE_DEST);
+ for (; ntrap; ntrap--, traps++)
+- (*ps->RasterizeTrapezoid) (pPicture, traps, -bounds.x1, -bounds.y1);
++ if (xTrapezoidValid(traps))
++ (*ps->RasterizeTrapezoid) (pPicture, traps, -bounds.x1, -bounds.y1);
+ exaFinishAccess(pPicture->pDrawable, EXA_PREPARE_DEST);
+
+ xRel = bounds.x1 + xSrc - xDst;
+diff --git a/render/picture.h b/render/picture.h
+index c85353a..fcd6401 100644
+--- a/render/picture.h
++++ b/render/picture.h
+@@ -211,7 +211,7 @@ typedef pixman_fixed_t xFixed;
+ /* whether 't' is a well defined not obviously empty trapezoid */
+ #define xTrapezoidValid(t) ((t)->left.p1.y != (t)->left.p2.y && \
+ (t)->right.p1.y != (t)->right.p2.y && \
+- (int) ((t)->bottom - (t)->top) > 0)
++ ((t)->bottom > (t)->top))
+
+ /*
+ * Standard NTSC luminance conversions:
+