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From 94c718948745cb7359002dbfd0e298203e574e02 Mon Sep 17 00:00:00 2001
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Message-Id: <94c718948745cb7359002dbfd0e298203e574e02@dist-git>
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From: "Richard W.M. Jones" <rjones@redhat.com>
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Date: Fri, 26 May 2017 16:05:04 +0200
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Subject: [PATCH] rpc: Double buffer size instead of quadrupling buffer size.
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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When increasing the buffer size up to VIR_NET_MESSAGE_MAX, we
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currently quadruple it each time. This unfortunately means that we
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cannot allow certain buffer sizes -- for example the current
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VIR_NET_MESSAGE_MAX == 33554432 can never be "hit" since ‘newlen’
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jumps from 16MB to 64MB.
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Instead of quadrupling, double it each time.
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Thanks: Daniel Berrange.
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Signed-off-by: Richard W.M. Jones <rjones@redhat.com>
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(cherry picked from commit b088f85d42a05a6c0c8418c02a67b48864ba95a3)
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Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1440683
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Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
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---
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src/rpc/virnetmessage.c | 3 ++-
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1 file changed, 2 insertions(+), 1 deletion(-)
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diff --git a/src/rpc/virnetmessage.c b/src/rpc/virnetmessage.c
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index c3a2e595c..5908b074a 100644
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--- a/src/rpc/virnetmessage.c
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+++ b/src/rpc/virnetmessage.c
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@@ -358,7 +358,8 @@ int virNetMessageEncodePayload(virNetMessagePtr msg,
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/* Try to encode the payload. If the buffer is too small increase it. */
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while (!(*filter)(&xdr, data, 0)) {
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- unsigned int newlen = (msg->bufferLength - VIR_NET_MESSAGE_LEN_MAX) * 4;
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+ unsigned int newlen = msg->bufferLength - VIR_NET_MESSAGE_LEN_MAX;
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+ newlen *= 2;
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if (newlen > VIR_NET_MESSAGE_MAX) {
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virReportError(VIR_ERR_RPC, "%s", _("Unable to encode message payload"));
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--
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2.13.0
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