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CVE-2008-2362 - RENDER Extension memory corruption

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Integer overflows can occur in the code validating the parameters for
the SProcRenderCreateLinearGradient, SProcRenderCreateRadialGradient
and SProcRenderCreateConicalGradient functions, leading to memory
corruption by swapping bytes outside of the intended request
parameters.
This commit is contained in:
Matthieu Herrb 2008-06-10 12:23:03 -06:00 • committed by Matthieu Herrb
parent 5257a0f83d
commit 9171206db3
1 changed files with 12 additions and 4 deletions
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16
render/render.c
View file

@ -1996,6 +1996,8 @@ static int ProcRenderCreateLinearGradient (ClientPtr client)
LEGAL_NEW_RESOURCE(stuff->pid, client);
len = (client->req_len << 2) - sizeof(xRenderCreateLinearGradientReq);
if (stuff->nStops > UINT32_MAX/(sizeof(xFixed) + sizeof(xRenderColor)))
return BadLength;
if (len != stuff->nStops*(sizeof(xFixed) + sizeof(xRenderColor)))
return BadLength;
@ -2584,18 +2586,18 @@ SProcRenderCreateSolidFill(ClientPtr client)
return (*ProcRenderVector[stuff->renderReqType]) (client);
}
static void swapStops(void *stuff, int n)
static void swapStops(void *stuff, int num)
{
int i;
int i, n;
CARD32 *stops;
CARD16 *colors;
stops = (CARD32 *)(stuff);
for (i = 0; i < n; ++i) {
for (i = 0; i < num; ++i) {
swapl(stops, n);
++stops;
}
colors = (CARD16 *)(stops);
for (i = 0; i < 4*n; ++i) {
for (i = 0; i < 4*num; ++i) {
swaps(stops, n);
++stops;
}
@ -2618,6 +2620,8 @@ SProcRenderCreateLinearGradient (ClientPtr client)
swapl(&stuff->nStops, n);
len = (client->req_len << 2) - sizeof(xRenderCreateLinearGradientReq);
if (stuff->nStops > UINT32_MAX/(sizeof(xFixed) + sizeof(xRenderColor)))
return BadLength;
if (len != stuff->nStops*(sizeof(xFixed) + sizeof(xRenderColor)))
return BadLength;
@ -2645,6 +2649,8 @@ SProcRenderCreateRadialGradient (ClientPtr client)
swapl(&stuff->nStops, n);
len = (client->req_len << 2) - sizeof(xRenderCreateRadialGradientReq);
if (stuff->nStops > UINT32_MAX/(sizeof(xFixed) + sizeof(xRenderColor)))
return BadLength;
if (len != stuff->nStops*(sizeof(xFixed) + sizeof(xRenderColor)))
return BadLength;
@ -2669,6 +2675,8 @@ SProcRenderCreateConicalGradient (ClientPtr client)
swapl(&stuff->nStops, n);
len = (client->req_len << 2) - sizeof(xRenderCreateConicalGradientReq);
if (stuff->nStops > UINT32_MAX/(sizeof(xFixed) + sizeof(xRenderColor)))
return BadLength;
if (len != stuff->nStops*(sizeof(xFixed) + sizeof(xRenderColor)))
return BadLength;