Re: [Qemu-devel] [PATCH] intel-hda: fix stream search

[Andreas Färber]

Am 02.11.2011 12:56, schrieb Gerd Hoffmann:
> commit ba43d28916c4f51c19bd7366089155ce81bee058 introduces a bug:
> The stream-not-found case doesn't error out any more, instead the
> code silently uses the first stream.  Fix it.
> 
> Signed-off-by: Gerd Hoffmann <address@hidden>
> ---
>  hw/intel-hda.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/hw/intel-hda.c b/hw/intel-hda.c
> index 675b659..b7ec36d 100644
> --- a/hw/intel-hda.c
> +++ b/hw/intel-hda.c
> @@ -401,7 +401,7 @@ static bool intel_hda_xfer(HDACodecDevice *dev, uint32_t 
> stnr, bool output,
>              break;
>          }
>      }
> -    if (st == NULL) {
> +    if (s == 4) {
>          return false;
>      }
>      if (st->bpl == NULL) {

The commit message doesn't say it clearly: Is st == NULL impossible?
If not, this introduces a potential NULL pointer dereference at st->bpl.

Andreas

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