06cef3a015
CVE-2012-4433 gegl: Integer overflow, leading to heap-based buffer overflow by parsing PPM image headers ok aja@
116 lines
3.5 KiB
Plaintext
116 lines
3.5 KiB
Plaintext
$OpenBSD: patch-operations_external_ppm-load_c,v 1.1 2012/11/06 12:59:09 jasper Exp $
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From 4757cdf73d3675478d645a3ec8250ba02168a230 Mon Sep 17 00:00:00 2001
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From: Nils Philippsen <nils@redhat.com>
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Date: Tue, 16 Oct 2012 14:56:40 +0000
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Subject: ppm-load: CVE-2012-4433: add plausibility checks for header fields
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From 1e92e5235ded0415d555aa86066b8e4041ee5a53 Mon Sep 17 00:00:00 2001
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From: Nils Philippsen <nils@redhat.com>
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Date: Tue, 16 Oct 2012 14:58:27 +0000
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Subject: ppm-load: CVE-2012-4433: don't overflow memory allocation
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--- operations/external/ppm-load.c.orig Tue Nov 6 13:07:25 2012
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+++ operations/external/ppm-load.c Tue Nov 6 13:07:16 2012
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@@ -36,6 +36,7 @@ gegl_chant_file_path (path, _("File"), "", _("Path of
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#include "gegl-chant.h"
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#include <stdio.h>
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#include <stdlib.h>
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+#include <errno.h>
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typedef enum {
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PIXMAP_ASCII = 51,
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@@ -44,8 +45,8 @@ typedef enum {
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typedef struct {
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map_type type;
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- gint width;
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- gint height;
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+ glong width;
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+ glong height;
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gsize numsamples; /* width * height * channels */
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gsize bpc; /* bytes per channel */
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guchar *data;
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@@ -82,12 +83,33 @@ ppm_load_read_header(FILE *fp,
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}
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/* Get Width and Height */
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- img->width = strtol (header,&ptr,0);
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- img->height = atoi (ptr);
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- img->numsamples = img->width * img->height * CHANNEL_COUNT;
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+ errno = 0;
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+ img->width = strtol (header,&ptr,10);
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+ if (errno)
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+ {
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+ g_warning ("Error reading width: %s", strerror(errno));
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+ return FALSE;
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+ }
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+ else if (img->width < 0)
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+ {
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+ g_warning ("Error: width is negative");
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+ return FALSE;
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+ }
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+ img->height = strtol (ptr,&ptr,10);
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+ if (errno)
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+ {
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+ g_warning ("Error reading height: %s", strerror(errno));
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+ return FALSE;
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+ }
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+ else if (img->width < 0)
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+ {
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+ g_warning ("Error: height is negative");
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+ return FALSE;
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+ }
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+
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fgets (header,MAX_CHARS_IN_ROW,fp);
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- maxval = strtol (header,&ptr,0);
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+ maxval = strtol (header,&ptr,10);
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if ((maxval != 255) && (maxval != 65535))
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{
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@@ -109,6 +131,16 @@ ppm_load_read_header(FILE *fp,
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g_warning ("%s: Programmer stupidity error", G_STRLOC);
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}
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+ /* Later on, img->numsamples is multiplied with img->bpc to allocate
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+ * memory. Ensure it doesn't overflow. */
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+ if (!img->width || !img->height ||
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+ G_MAXSIZE / img->width / img->height / CHANNEL_COUNT < img->bpc)
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+ {
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+ g_warning ("Illegal width/height: %ld/%ld", img->width, img->height);
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+ return FALSE;
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+ }
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+ img->numsamples = img->width * img->height * CHANNEL_COUNT;
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+
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return TRUE;
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}
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@@ -229,11 +261,23 @@ process (GeglOperation *operation,
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if (!ppm_load_read_header (fp, &img))
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goto out;
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- rect.height = img.height;
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- rect.width = img.width;
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-
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/* Allocating Array Size */
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+
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+ /* Should use g_try_malloc(), but this causes crashes elsewhere because the
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+ * error signalled by returning FALSE isn't properly acted upon. Therefore
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+ * g_malloc() is used here which aborts if the requested memory size can't be
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+ * allocated causing a controlled crash. */
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img.data = (guchar*) g_malloc (img.numsamples * img.bpc);
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+
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+ /* No-op without g_try_malloc(), see above. */
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+ if (! img.data)
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+ {
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+ g_warning ("Couldn't allocate %" G_GSIZE_FORMAT " bytes, giving up.", ((gsize)img.numsamples * img.bpc));
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+ goto out;
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+ }
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+
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+ rect.height = img.height;
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+ rect.width = img.width;
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switch (img.bpc)
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{
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