[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Qemu-devel] [PATCH] audio/hda: fix guest triggerable assert
From: |
Dr. David Alan Gilbert |
Subject: |
Re: [Qemu-devel] [PATCH] audio/hda: fix guest triggerable assert |
Date: |
Thu, 22 Nov 2018 15:52:12 +0000 |
User-agent: |
Mutt/1.10.1 (2018-07-13) |
* Gerd Hoffmann (address@hidden) wrote:
> Guest writes to a readonly register trigger the assert in
> intel_hda_reg_write(). Add a check and just ignore them.
>
> Buglink: https://bugzilla.redhat.com/show_bug.cgi?id=1628433
> Signed-off-by: Gerd Hoffmann <address@hidden>
Does make you wonder:
a) Why the guest was writing to a read-only register
b) Wth it only did it in the weird combination of
devices tested.
Reviewed-by: Dr. David Alan Gilbert <address@hidden>
> ---
> hw/audio/intel-hda.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/hw/audio/intel-hda.c b/hw/audio/intel-hda.c
> index 23a2cf6484..066532713c 100644
> --- a/hw/audio/intel-hda.c
> +++ b/hw/audio/intel-hda.c
> @@ -929,6 +929,10 @@ static void intel_hda_reg_write(IntelHDAState *d, const
> IntelHDAReg *reg, uint32
> if (!reg) {
> return;
> }
> + if (!reg->wmask) {
> + /* read-only register */
> + return;
> + }
>
> if (d->debug) {
> time_t now = time(NULL);
> --
> 2.9.3
>
>
--
Dr. David Alan Gilbert / address@hidden / Manchester, UK