File 0003-quic-Check-RLE-lengths.patch of Package spice.19892

From f0d36ed686902d1fb19b17cf08acc6c0319d0d73 Mon Sep 17 00:00:00 2001
From: Frediano Ziglio <freddy77@gmail.com>
Date: Wed, 29 Apr 2020 15:11:38 +0100
Subject: [PATCH 3/4] quic: Check RLE lengths

Avoid buffer overflows decoding images. On compression we compute
lengths till end of line so it won't cause regressions.
Proved by fuzzing the code.

Signed-off-by: Frediano Ziglio <freddy77@gmail.com>
Acked-by: Uri Lublin <uril@redhat.com>
Signed-off-by: Bruce Rogers <brogers@suse.com>
---
 spice-common/common/quic_tmpl.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletion(-)

diff --git a/spice-common/common/quic_tmpl.c b/spice-common/common/quic_tmpl.c
index c2a1b66..14b86f4 100644
--- a/spice-common/common/quic_tmpl.c
+++ b/spice-common/common/quic_tmpl.c
@@ -563,10 +563,14 @@ do_run:
         channel->state.waitcnt = stopidx - i;
         run_index = i;
 #ifdef RLE_STAT
-        run_end = i + decode_channel_run(encoder, channel);
+        run_end = decode_channel_run(encoder, channel);
 #else
-        run_end = i + decode_run(encoder);
+        run_end = decode_run(encoder);
 #endif
+        if (run_end < 0 || run_end > (end - i)) {
+            encoder->usr->error(encoder->usr, "wrong RLE\n");
+        }
+        run_end += i;
 
         for (; i < run_end; i++) {
             cur_row[i].a = cur_row[i - 1].a;
-- 
2.28.0