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ImageMagick.6463
ImageMagick-CVE-2016-4562,4563,4564.patch
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File ImageMagick-CVE-2016-4562,4563,4564.patch of Package ImageMagick.6463
m 2d009ebb22bcc8865e2ffecf5764ac4f1599a647 Mon Sep 17 00:00:00 2001 From: Cristy <urban-warrior@imagemagick.org> Date: Wed, 4 May 2016 19:08:19 -0400 Subject: [PATCH] Prevent buffer overflow in magick/draw.c Index: ImageMagick-6.8.9-8/magick/draw.c =================================================================== --- ImageMagick-6.8.9-8.orig/magick/draw.c 2014-05-01 02:42:05.000000000 +0200 +++ ImageMagick-6.8.9-8/magick/draw.c 2016-06-08 09:01:46.292651843 +0200 @@ -1584,7 +1584,7 @@ static MagickBooleanType DrawDashPolygon status=MagickTrue; maximum_length=0.0; total_length=0.0; - for (i=1; i < (ssize_t) number_vertices; i++) + for (i=1; (i < (ssize_t) number_vertices) && (length >= 0.0); i++) { dx=primitive_info[i].point.x-primitive_info[i-1].point.x; dy=primitive_info[i].point.y-primitive_info[i-1].point.y; @@ -1701,6 +1701,135 @@ static inline void TracePoint(PrimitiveI primitive_info->point=point; } +static void GetNextToken(const char *start,const char **end, + const size_t extent,char *token) +{ + double + value; + + register const char + *p; + + register ssize_t + i; + + assert(start != (const char *) NULL); + assert(token != (char *) NULL); + i=0; + p=start; + while ((isspace((int) ((unsigned char) *p)) != 0) && (*p != '\0')) + p++; + switch (*p) + { + case '\0': + break; + case '"': + case '\'': + case '`': + case '{': + { + register char + escape; + + switch (*p) + { + case '"': escape='"'; break; + case '\'': escape='\''; break; + case '`': escape='\''; break; + case '{': escape='}'; break; + default: escape=(*p); break; + } + for (p++; *p != '\0'; p++) + { + if ((*p == '\\') && ((*(p+1) == escape) || (*(p+1) == '\\'))) + p++; + else + if (*p == escape) + { + p++; + break; + } + if (i < (ssize_t) (extent-1)) + token[i++]=(*p); + } + break; + } + case '/': + { + if (i < (ssize_t) (extent-1)) + token[i++]=(*p++); + if ((*p == '>') || (*p == '/')) + if (i < (ssize_t) (extent-1)) + token[i++]=(*p++); + break; + } + default: + { + char + *q; + + value=StringToDouble(p,&q); + (void) value; + if ((p != q) && (*p != ',')) + { + for ( ; (p < q) && (*p != ','); p++) + if (i < (ssize_t) (extent-1)) + token[i++]=(*p); + if (*p == '%') + if (i < (ssize_t) (extent-1)) + token[i++]=(*p++); + break; + } + if ((*p != '\0') && (isalpha((int) ((unsigned char) *p)) == 0) && + (*p != *DirectorySeparator) && (*p != '#') && (*p != '<')) + { + if (i < (ssize_t) (extent-1)) + token[i++]=(*p++); + break; + } + for ( ; *p != '\0'; p++) + { + if (((isspace((int) ((unsigned char) *p)) != 0) || (*p == '=') || + (*p == ',') || (*p == ':') || (*p == ';')) && (*(p-1) != '\\')) + break; + if ((i > 0) && (*p == '<')) + break; + if (i < (ssize_t) (extent-1)) + token[i++]=(*p); + if (*p == '>') + break; + if (*p == '(') + for (p++; *p != '\0'; p++) + { + if (i < (ssize_t) (extent-1)) + token[i++]=(*p); + if ((*p == ')') && (*(p-1) != '\\')) + break; + } + } + break; + } + } + token[i]='\0'; + if (LocaleNCompare(token,"url(",4) == 0) + { + ssize_t + offset; + + offset=4; + if (token[offset] == '#') + offset++; + i=(ssize_t) strlen(token); + (void) CopyMagickString(token,token+offset,MaxTextExtent); + token[i-offset-1]='\0'; + } + while (isspace((int) ((unsigned char) *p)) != 0) + p++; + if (end != (const char **) NULL) + *end=(const char *) p; +} + + MagickExport MagickBooleanType DrawImage(Image *image,const DrawInfo *draw_info) { #define RenderImageTag "Render/Image" @@ -1831,7 +1960,7 @@ MagickExport MagickBooleanType DrawImage /* Interpret graphic primitive. */ - GetMagickToken(q,&q,keyword); + GetNextToken(q,&q,MaxTextExtent,keyword); if (*keyword == '\0') break; if (*keyword == '#') @@ -2135,7 +2264,7 @@ MagickExport MagickBooleanType DrawImage if (LocaleCompare("font-weight",keyword) == 0) { GetMagickToken(q,&q,token); - graphic_context[n]->weight=StringToUnsignedLong(token); + graphic_context[n]->weight=(ssize_t) StringToUnsignedLong(token); if (LocaleCompare(token,"all") == 0) graphic_context[n]->weight=0; if (LocaleCompare(token,"bold") == 0) @@ -5985,17 +6114,29 @@ static PrimitiveInfo *TraceStrokePolygon } if (q >= (ssize_t) (max_strokes-6*BezierQuantum-360)) { - max_strokes+=6*BezierQuantum+360; - path_p=(PointInfo *) ResizeQuantumMemory(path_p,(size_t) max_strokes, - sizeof(*path_p)); - path_q=(PointInfo *) ResizeQuantumMemory(path_q,(size_t) max_strokes, - sizeof(*path_q)); - if ((path_p == (PointInfo *) NULL) || (path_q == (PointInfo *) NULL)) - { - polygon_primitive=(PrimitiveInfo *) - RelinquishMagickMemory(polygon_primitive); - return((PrimitiveInfo *) NULL); - } + if (~max_strokes < (6*BezierQuantum+360)) + { + path_p=(PointInfo *) RelinquishMagickMemory(path_p); + path_q=(PointInfo *) RelinquishMagickMemory(path_q); + } + else + { + max_strokes+=6*BezierQuantum+360; + path_p=(PointInfo *) ResizeQuantumMemory(path_p,max_strokes, + sizeof(*path_p)); + path_q=(PointInfo *) ResizeQuantumMemory(path_q,max_strokes, + sizeof(*path_q)); + } + if ((path_p == (PointInfo *) NULL) || (path_q == (PointInfo *) NULL)) + { + if (path_p != (PointInfo *) NULL) + path_p=(PointInfo *) RelinquishMagickMemory(path_p); + if (path_q != (PointInfo *) NULL) + path_q=(PointInfo *) RelinquishMagickMemory(path_q); + polygon_primitive=(PrimitiveInfo *) + RelinquishMagickMemory(polygon_primitive); + return((PrimitiveInfo *) NULL); + } } dot_product=dx.q*dy.p-dx.p*dy.q; if (dot_product <= 0.0) @@ -6057,7 +6198,7 @@ static PrimitiveInfo *TraceStrokePolygon q++; for (j=1; j < (ssize_t) arc_segments; j++) { - delta_theta=(j*(theta.q-theta.p)/arc_segments); + delta_theta=(double) (j*(theta.q-theta.p)/arc_segments); path_q[q].x=(double) (center.x+mid*cos(fmod((double) (theta.p+delta_theta),DegreesToRadians(360.0)))); path_q[q].y=(double) (center.y+mid*sin(fmod((double) @@ -6127,7 +6268,7 @@ static PrimitiveInfo *TraceStrokePolygon path_p[p++]=box_p[1]; for (j=1; j < (ssize_t) arc_segments; j++) { - delta_theta=(j*(theta.q-theta.p)/arc_segments); + delta_theta=(double) (j*(theta.q-theta.p)/arc_segments); path_p[p].x=(double) (center.x+mid*cos(fmod((double) (theta.p+delta_theta),DegreesToRadians(360.0)))); path_p[p].y=(double) (center.y+mid*sin(fmod((double)
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