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Backport of:
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From 0cf1400c61850065de590d403f6d49e32882fd76 Mon Sep 17 00:00:00 2001
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From: Rolf Eike Beer <eike@sf-mail.de>
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Date: Tue, 28 May 2019 18:30:46 +0200
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Subject: [PATCH] fix crash because of unaligned accesses in
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hybiReadAndDecode()
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[Ubuntu note: patch backported to apply on libvncserver/websockets.c instead of
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libvncserver/ws_decode.c
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-- Avital]
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---
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libvncserver/ws_decode.c | 7 ++++---
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1 file changed, 4 insertions(+), 3 deletions(-)
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--- a/libvncserver/websockets.c
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+++ b/libvncserver/websockets.c
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@@ -880,7 +880,6 @@ hybiReadAndDecode(rfbClientPtr cl, char
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int bufsize;
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int nextRead;
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unsigned char *data;
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- uint32_t *data32;
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ws_ctx_t *wsctx = (ws_ctx_t *)cl->wsctx;
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/* if data was carried over, copy to start of buffer */
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@@ -938,10 +937,12 @@ hybiReadAndDecode(rfbClientPtr cl, char
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/* for a possible base64 decoding, we decode multiples of 4 bytes until
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* the whole frame is received and carry over any remaining bytes in the carry buf*/
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data = (unsigned char *)hybiPayloadStart(wsctx);
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- data32= (uint32_t *)data;
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for (i = 0; i < (toDecode >> 2); i++) {
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- data32[i] ^= wsctx->header.mask.u;
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+ uint32_t tmp;
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+ memcpy(&tmp, data + i * sizeof(tmp), sizeof(tmp));
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+ tmp ^= wsctx->header.mask.u;
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+ memcpy(data + i * sizeof(tmp), &tmp, sizeof(tmp));
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}
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rfbLog("mask decoding; i=%d toDecode=%d\n", i, toDecode);
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