Hi All,
On 27/10/21 11:22 am, Kishon Vijay Abraham I wrote:
> bcdma_get_*() checks if bchan is already allocated by checking if it
> has a NON NULL value. For the error cases, bchan will have error value
> and bcdma_get_*() considers this as already allocated (PASS) since the
> error values are NON NULL. This results in NULL pointer dereference
> error while de-referencing bchan.
>
> Reset the value of bchan to NULL if the allocation actually fails.
>
> Signed-off-by: Kishon Vijay Abraham I <kishon@xxxxxx>
Please ignore this series. There was some stray patches left which I failed to
notice before sending. I'll resend a clean one.
Thanks,
Kishon
> ---
> drivers/dma/ti/k3-udma.c | 8 ++++++--
> 1 file changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/dma/ti/k3-udma.c b/drivers/dma/ti/k3-udma.c
> index a35858610780..14ae28830871 100644
> --- a/drivers/dma/ti/k3-udma.c
> +++ b/drivers/dma/ti/k3-udma.c
> @@ -1348,6 +1348,7 @@ static int bcdma_get_bchan(struct udma_chan *uc)
> {
> struct udma_dev *ud = uc->ud;
> enum udma_tp_level tpl;
> + int ret;
>
> if (uc->bchan) {
> dev_dbg(ud->dev, "chan%d: already have bchan%d allocated\n",
> @@ -1365,8 +1366,11 @@ static int bcdma_get_bchan(struct udma_chan *uc)
> tpl = ud->bchan_tpl.levels - 1;
>
> uc->bchan = __udma_reserve_bchan(ud, tpl, -1);
> - if (IS_ERR(uc->bchan))
> - return PTR_ERR(uc->bchan);
> + if (IS_ERR(uc->bchan)) {
> + ret = PTR_ERR(uc->bchan);
> + uc->bchan = NULL;
> + return ret;
> + }
>
> uc->tchan = uc->bchan;
>
>
