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diff -up openssh-8.0p1/channels.c.channel-limits openssh-8.0p1/channels.c
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--- openssh-8.0p1/channels.c.channel-limits 2021-03-16 12:17:58.905576511 +0100
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+++ openssh-8.0p1/channels.c 2021-03-16 12:17:58.925576667 +0100
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@@ -354,6 +354,7 @@ channel_new(struct ssh *ssh, char *ctype
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struct ssh_channels *sc = ssh->chanctxt;
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u_int i, found;
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Channel *c;
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+ int r;
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/* Try to find a free slot where to put the new channel. */
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for (i = 0; i < sc->channels_alloc; i++) {
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@@ -383,6 +384,8 @@ channel_new(struct ssh *ssh, char *ctype
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(c->output = sshbuf_new()) == NULL ||
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(c->extended = sshbuf_new()) == NULL)
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fatal("%s: sshbuf_new failed", __func__);
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+ if ((r = sshbuf_set_max_size(c->input, CHAN_INPUT_MAX)) != 0)
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+ fatal("%s: sshbuf_set_max_size: %s", __func__, ssh_err(r));
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c->ostate = CHAN_OUTPUT_OPEN;
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c->istate = CHAN_INPUT_OPEN;
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channel_register_fds(ssh, c, rfd, wfd, efd, extusage, nonblock, 0);
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diff -up openssh-8.0p1/channels.h.channel-limits openssh-8.0p1/channels.h
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--- openssh-8.0p1/channels.h.channel-limits 2021-03-16 12:17:58.868576223 +0100
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+++ openssh-8.0p1/channels.h 2021-03-16 12:17:58.907576527 +0100
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@@ -215,6 +215,9 @@ struct Channel {
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/* Read buffer size */
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#define CHAN_RBUF (16*1024)
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+/* Maximum channel input buffer size */
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+#define CHAN_INPUT_MAX (16*1024*1024)
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+
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/* Hard limit on number of channels */
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#define CHANNELS_MAX_CHANNELS (16*1024)
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