From 4d7c422a37eb9617fb22f8e37527c2b34b105665 Mon Sep 17 00:00:00 2001 From: Alan Coopersmith Date: Sat, 2 Mar 2013 11:04:44 -0800 Subject: unvalidated index in _XkbReadExplicitComponents() [CVE-2013-1997 9/15] If the X server returns key indexes outside the range of the number of keys it told us to allocate, out of bounds memory writes could occur. Reported-by: Ilja Van Sprundel Signed-off-by: Alan Coopersmith Reviewed-by: Matthieu Herrb --- src/xkb/XKBGetMap.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) (limited to 'src/xkb/XKBGetMap.c') diff --git a/src/xkb/XKBGetMap.c b/src/xkb/XKBGetMap.c index a68455bd..ea77f2a3 100644 --- a/src/xkb/XKBGetMap.c +++ b/src/xkb/XKBGetMap.c @@ -362,8 +362,10 @@ register int i; unsigned char *wire; if ( rep->totalKeyExplicit>0 ) { + int size = xkb->max_key_code + 1; + if ( ((int) rep->firstKeyExplicit + rep->nKeyExplicit) > size) + return BadLength; if ( xkb->server->explicit == NULL ) { - int size = xkb->max_key_code+1; xkb->server->explicit = _XkbTypedCalloc(size,unsigned char); if (xkb->server->explicit==NULL) return BadAlloc; @@ -377,6 +379,8 @@ unsigned char *wire; if (!wire) return BadLength; for (i=0;itotalKeyExplicit;i++,wire+=2) { + if (wire[0] > xkb->max_key_code || wire[1] > xkb->max_key_code) + return BadLength; xkb->server->explicit[wire[0]]= wire[1]; } } -- cgit v1.2.3