16 lines
616 B
Diff
16 lines
616 B
Diff
diff --git a/hw/xfree86/common/xf86MiscExt.c b/hw/xfree86/common/xf86MiscExt.c
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index c1b9c60..40c196a 100644
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--- a/hw/xfree86/common/xf86MiscExt.c
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+++ b/hw/xfree86/common/xf86MiscExt.c
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@@ -548,6 +548,10 @@ MiscExtPassMessage(int scrnIndex, const char *msgtype, const char *msgval,
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{
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ScrnInfoPtr pScr = xf86Screens[scrnIndex];
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+ /* should check this in the protocol, but xf86NumScreens isn't exported */
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+ if (scrnIndex >= xf86NumScreens)
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+ return BadValue;
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+
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if (*pScr->HandleMessage == NULL)
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return BadImplementation;
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return (*pScr->HandleMessage)(scrnIndex, msgtype, msgval, retstr);
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