From: Volker Rümelin Date: Fri, 2 Aug 2024 07:18:05 +0000 (+0200) Subject: hw/audio/virtio-snd: fix invalid param check X-Git-Tag: qemu-xen-4.20.0~11^2~1 X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=7d14471a121878602cb4e748c4707f9ab9a9e3e2;p=qemu-xen.git hw/audio/virtio-snd: fix invalid param check Commit 9b6083465f ("virtio-snd: check for invalid param shift operands") tries to prevent invalid parameters specified by the guest. However, the code is not correct. Change the code so that the parameters format and rate, which are a bit numbers, are compared with the bit size of the data type. Fixes: 9b6083465f ("virtio-snd: check for invalid param shift operands") Signed-off-by: Volker Rümelin Message-Id: <20240802071805.7123-1-vr_qemu@t-online.de> Reviewed-by: Manos Pitsidianakis Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin --- diff --git a/hw/audio/virtio-snd.c b/hw/audio/virtio-snd.c index e5196aa4bb..d1cf5eb445 100644 --- a/hw/audio/virtio-snd.c +++ b/hw/audio/virtio-snd.c @@ -282,12 +282,12 @@ uint32_t virtio_snd_set_pcm_params(VirtIOSound *s, error_report("Number of channels is not supported."); return cpu_to_le32(VIRTIO_SND_S_NOT_SUPP); } - if (BIT(params->format) > sizeof(supported_formats) || + if (params->format >= sizeof(supported_formats) * BITS_PER_BYTE || !(supported_formats & BIT(params->format))) { error_report("Stream format is not supported."); return cpu_to_le32(VIRTIO_SND_S_NOT_SUPP); } - if (BIT(params->rate) > sizeof(supported_rates) || + if (params->rate >= sizeof(supported_rates) * BITS_PER_BYTE || !(supported_rates & BIT(params->rate))) { error_report("Stream rate is not supported."); return cpu_to_le32(VIRTIO_SND_S_NOT_SUPP);