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ensure c->local_window doesn't underflow during updates;

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similar to checks performed elsewhere. From Renaud Allard
This commit is contained in:
djm
2026-03-28 05:16:18 +00:00
parent 102666c504
commit 41316900b8
1 changed files with 5 additions and 2 deletions
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usr.bin/ssh/channels.c
+5 -2
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@@ -1,4 +1,4 @@
/* $OpenBSD: channels.c,v 1.457 2026/03/05 05:40:35 djm Exp $ */
/* $OpenBSD: channels.c,v 1.458 2026/03/28 05:16:18 djm Exp $ */
/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
@@ -3471,7 +3471,10 @@ channel_input_data(int type, uint32_t seq, struct ssh *ssh)
* updates are sent back. Otherwise the connection might deadlock.
*/
if (c->ostate != CHAN_OUTPUT_OPEN) {
c->local_window -= win_len;
if (win_len > c->local_window)
c->local_window = 0;
else
c->local_window -= win_len;
c->local_consumed += win_len;
return 0;
}