diff options
Diffstat (limited to 'Xext/EVI.c')
| -rw-r--r-- | Xext/EVI.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/Xext/EVI.c b/Xext/EVI.c index 4bd050ca7..a637bae5d 100644 --- a/Xext/EVI.c +++ b/Xext/EVI.c @@ -34,6 +34,7 @@ THE USE OR PERFORMANCE OF THIS SOFTWARE. #include <X11/extensions/XEVIstr.h> #include "EVIstruct.h" #include "modinit.h" +#include "scrnintstr.h" static EviPrivPtr eviPriv; @@ -84,10 +85,22 @@ ProcEVIGetVisualInfo(ClientPtr client) { REQUEST(xEVIGetVisualInfoReq); xEVIGetVisualInfoReply rep; - int n, n_conflict, n_info, sz_info, sz_conflict; + int i, n, n_conflict, n_info, sz_info, sz_conflict; VisualID32 *conflict; + unsigned int total_visuals = 0; xExtendedVisualInfo *eviInfo; int status; + + /* + * do this first, otherwise REQUEST_FIXED_SIZE can overflow. we assume + * here that you don't have more than 2^32 visuals over all your screens; + * this seems like a safe assumption. + */ + for (i = 0; i < screenInfo.numScreens; i++) + total_visuals += screenInfo.screens[i]->numVisuals; + if (stuff->n_visual > total_visuals) + return BadValue; + REQUEST_FIXED_SIZE(xEVIGetVisualInfoReq, stuff->n_visual * sz_VisualID32); status = eviPriv->getVisualInfo((VisualID32 *)&stuff[1], (int)stuff->n_visual, &eviInfo, &n_info, &conflict, &n_conflict); |