From 6037a9074d52b1963c97cb28ea1096c7c14cbf28 Mon Sep 17 00:00:00 2001 From: Nicolas Ruff Date: Mon, 18 Aug 2014 15:16:16 +0200 Subject: [PATCH] Check malloc() return value on client->server ClientCutText message. Client can send up to 2**32-1 bytes of text, and such a large allocation is likely to fail in case of high memory pressure. This would in a server crash (write at address 0). --- libvncserver/rfbserver.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/libvncserver/rfbserver.c b/libvncserver/rfbserver.c index 5f3b31d..7e43fe3 100644 --- a/libvncserver/rfbserver.c +++ b/libvncserver/rfbserver.c @@ -2461,6 +2461,11 @@ rfbProcessClientNormalMessage(rfbClientPtr cl) msg.cct.length = Swap32IfLE(msg.cct.length); str = (char *)malloc(msg.cct.length); + if (str == NULL) { + rfbLogPerror("rfbProcessClientNormalMessage: not enough memory"); + rfbCloseClient(cl); + return; + } if ((n = rfbReadExact(cl, str, msg.cct.length)) <= 0) { if (n != 0)