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From 96c8fcafa7325cd0e8a23a743a55f0ad0aa9f79b Mon Sep 17 00:00:00 2001
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From: Gerd Hoffmann <kraxel@redhat.com>
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Date: Thu, 18 Mar 2021 09:13:42 -0400
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Subject: [PATCH 5/5] audio: audio_generic_get_buffer_in should honor *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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RH-Author: Gerd Hoffmann <kraxel@redhat.com>
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Message-id: <20210318091342.3232471-2-kraxel@redhat.com>
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Patchwork-id: 101352
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O-Subject: [RHEL-8.4.0 qemu-kvm PATCH 1/1] audio: audio_generic_get_buffer_in should honor *size
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Bugzilla: 1932823
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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RH-Acked-by: Danilo de Paula <ddepaula@redhat.com>
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RH-Acked-by: Philippe Mathieu-Daudé <philmd@redhat.com>
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From: Volker Rümelin <vr_qemu@t-online.de>
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The function generic_get_buffer_in currently ignores the *size
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parameter and may return a buffer larger than *size.
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As a result the variable samples in function
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audio_pcm_hw_run_in may underflow. The while loop then most
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likely will never termiate.
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Buglink: http://bugs.debian.org/948658
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Signed-off-by: Volker Rümelin <vr_qemu@t-online.de>
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Message-Id: <20200123074943.6699-9-vr_qemu@t-online.de>
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Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
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(cherry picked from commit 599eac4e5a41e828645594097daee39373acc3c0)
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Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
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---
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audio/audio.c | 3 ++-
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1 file changed, 2 insertions(+), 1 deletion(-)
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diff --git a/audio/audio.c b/audio/audio.c
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index 56fae55047..39a62fc62a 100644
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--- a/audio/audio.c
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+++ b/audio/audio.c
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@@ -1402,7 +1402,8 @@ void *audio_generic_get_buffer_in(HWVoiceIn *hw, size_t *size)
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}
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assert(start >= 0 && start < hw->size_emul);
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- *size = MIN(hw->pending_emul, hw->size_emul - start);
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+ *size = MIN(*size, hw->pending_emul);
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+ *size = MIN(*size, hw->size_emul - start);
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return hw->buf_emul + start;
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}
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--
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2.27.0
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