R6xx/R7xx: Add checks to make sure we don't overrun VB space

2 files changed, 25 insertions, 0 deletions

diff --git a/src/r600_exa.c b/src/r600_exa.c
index 9503485..45103c4 100644
--- a/src/r600_exa.c
+++ b/src/r600_exa.c
@@ -260,6 +260,11 @@ R600Solid(PixmapPtr pPix, int x1, int y1, int x2, int y2)
     struct r6xx_solid_vertex vertex[3];
     struct r6xx_solid_vertex *solid_vb = (pointer)((char*)accel_state->ib->address + (accel_state->ib->total / 2));
 
+    if (((accel_state->vb_index + 3) * 8) > (accel_state->ib->total / 2)) {
+	ErrorF("Ran out of VB space!\n");
+	return;
+    }
+
     vertex[0].x = (float)x1;
     vertex[0].y = (float)y1;
 
@@ -602,6 +607,11 @@ R600AppendCopyVertex(ScrnInfoPtr pScrn,
     struct r6xx_copy_vertex *copy_vb = (pointer)((char*)accel_state->ib->address + (accel_state->ib->total / 2));
     struct r6xx_copy_vertex vertex[3];
 
+    if (((accel_state->vb_index + 3) * 16) > (accel_state->ib->total / 2)) {
+	ErrorF("Ran out of VB space!\n");
+	return;
+    }
+
     vertex[0].x = (float)dstX;
     vertex[0].y = (float)dstY;
     vertex[0].s = (float)srcX;
@@ -1905,6 +1915,11 @@ static void R600Composite(PixmapPtr pDst,
 	struct r6xx_comp_mask_vertex vertex[3];
 	xPointFixed maskTopLeft, maskTopRight, maskBottomLeft, maskBottomRight;
 
+	if (((accel_state->vb_index + 3) * 24) > (accel_state->ib->total / 2)) {
+	    ErrorF("Ran out of VB space!\n");
+	    return;
+	}
+
 	maskTopLeft.x     = IntToxFixed(maskX);
 	maskTopLeft.y     = IntToxFixed(maskY);
 	maskTopRight.x    = IntToxFixed(maskX + w);
@@ -1961,6 +1976,11 @@ static void R600Composite(PixmapPtr pDst,
 	    (pointer)((char*)accel_state->ib->address + (accel_state->ib->total / 2));
 	struct r6xx_comp_vertex vertex[3];
 
+	if (((accel_state->vb_index + 3) * 16) > (accel_state->ib->total / 2)) {
+	    ErrorF("Ran out of VB space!\n");
+	    return;
+	}
+
 	vertex[0].x = (float)dstX;
 	vertex[0].y = (float)dstY;
 	vertex[0].src_s = xFixedToFloat(srcTopLeft.x) / accel_state->texW[0];
diff --git a/src/r600_textured_videofuncs.c b/src/r600_textured_videofuncs.c
index 1fcc93c..7916871 100644
--- a/src/r600_textured_videofuncs.c
+++ b/src/r600_textured_videofuncs.c
@@ -411,6 +411,11 @@ R600DisplayTexturedVideo(ScrnInfoPtr pScrn, struct RHDPortPriv *pPriv)
 	struct r6xx_copy_vertex *xv_vb = (pointer)((char*)accel_state->ib->address + (accel_state->ib->total / 2));
 	struct r6xx_copy_vertex vertex[3];
 
+	if (((accel_state->vb_index + 3) * 16) > (accel_state->ib->total / 2)) {
+	    ErrorF("Ran out of VB space!\n");
+	    break;
+	}
+
 	dstX = pBox->x1 + dstxoff;
 	dstY = pBox->y1 + dstyoff;
 	dstw = pBox->x2 - pBox->x1;