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Xdmx: integer overflow in GetGLXVisualConfigs()

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numVisuals & numProps are both CARD32 and need to be bounds checked before
multiplying by structure sizes to come up with the total size to allocate,
to avoid integer overflow leading to underallocation and writing data from
the network past the end of the allocated buffer.

Reported-by: Ilja Van Sprundel <ivansprundel@ioactive.com>
Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
This commit is contained in:
Alan Coopersmith
2013-04-14 09:33:57 -07:00
parent 74469895e3
commit c89bcd12f4
1 changed files with 9 additions and 4 deletions
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13
hw/dmx/dmx_glxvisuals.c
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@@ -37,6 +37,7 @@
#include <GL/glxproto.h>
#include <X11/extensions/Xext.h>
#include <X11/extensions/extutil.h>
#include <limits.h>
#include "dmx_glxvisuals.h"
@@ -84,7 +85,10 @@ GetGLXVisualConfigs(Display * dpy, int screen, int *nconfigs)
SyncHandle();
return NULL;
}
props = (INT32 *) Xmalloc(nprops * __GLX_SIZE_CARD32);
if (nprops < (INT_MAX / __GLX_SIZE_CARD32))
props = Xmalloc(nprops * __GLX_SIZE_CARD32);
else
props = NULL;
if (!props) {
UnlockDisplay(dpy);
SyncHandle();
@@ -92,15 +96,16 @@ GetGLXVisualConfigs(Display * dpy, int screen, int *nconfigs)
}
/* Allocate memory for our config structure */
config = (__GLXvisualConfig *)
Xmalloc(nvisuals * sizeof(__GLXvisualConfig));
if (nvisuals < (INT_MAX / sizeof(__GLXvisualConfig)))
config = Xcalloc(nvisuals, sizeof(__GLXvisualConfig));
else
config = NULL;
if (!config) {
free(props);
UnlockDisplay(dpy);
SyncHandle();
return NULL;
}
memset(config, 0, nvisuals * sizeof(__GLXvisualConfig));
configs = config;
num_good_visuals = 0;