[PATCH] i3c: master: require dests for read CCC commands

[PATCH] i3c: master: require dests for read CCC commands

[Adrian Ng Ho Yin]

Read CCC commands (rnw set) always need a destination array to store
payload data. Extend the existing direct-CCC validation so cmd->dests
is guaranteed non-NULL when cmd->rnw is set.

Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <error27@gmail.com>
Closes: https://lore.kernel.org/r/202607222347.TXH6r6ie-lkp@intel.com/
Signed-off-by: Adrian Ng Ho Yin <adrian.ho.yin.ng@altera.com>
---
 drivers/i3c/master.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c
index fd3e79d10c84..0249886d319b 100644
--- a/drivers/i3c/master.c
+++ b/drivers/i3c/master.c
@@ -1039,7 +1039,8 @@ static int i3c_master_send_ccc_cmd_locked(struct i3c_master_controller *master,
 	if (!master->ops->send_ccc_cmd)
 		return -EOPNOTSUPP;
 
-	if ((cmd->id & I3C_CCC_DIRECT) && (!cmd->dests || !cmd->ndests))
+	if ((cmd->rnw || (cmd->id & I3C_CCC_DIRECT)) &&
+	    (!cmd->dests || !cmd->ndests))
 		return -EINVAL;
 
 	if (master->ops->supports_ccc_cmd &&
-- 
2.49.GIT

Re: [PATCH] i3c: master: require dests for read CCC commands

[Mukesh Savaliya]

On 7/23/2026 2:53 PM, Adrian Ng Ho Yin wrote:
> Read CCC commands (rnw set) always need a destination array to store
> payload data. Extend the existing direct-CCC validation so cmd->dests
> is guaranteed non-NULL when cmd->rnw is set.
> 
> Reported-by: kernel test robot <lkp@intel.com>
> Reported-by: Dan Carpenter <error27@gmail.com>
> Closes: https://lore.kernel.org/r/202607222347.TXH6r6ie-lkp@intel.com/
> Signed-off-by: Adrian Ng Ho Yin <adrian.ho.yin.ng@altera.com>
> ---
>   drivers/i3c/master.c | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
> 

Acked-by: Mukesh Kumar Savaliya <mukesh.savaliya@oss.qualcomm.com>

Re: [PATCH] i3c: master: require dests for read CCC commands

[Frank Li]

On Thu, Jul 23, 2026 at 05:23:10PM +0800, Adrian Ng Ho Yin wrote:
> Read CCC commands (rnw set) always need a destination array to store
> payload data. Extend the existing direct-CCC validation so cmd->dests
> is guaranteed non-NULL when cmd->rnw is set.
>
> Reported-by: kernel test robot <lkp@intel.com>
> Reported-by: Dan Carpenter <error27@gmail.com>
> Closes: https://lore.kernel.org/r/202607222347.TXH6r6ie-lkp@intel.com/
> Signed-off-by: Adrian Ng Ho Yin <adrian.ho.yin.ng@altera.com>
> ---

Reviewed-by: Frank Li <Frank.Li@nxp.com>

>  drivers/i3c/master.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c
> index fd3e79d10c84..0249886d319b 100644
> --- a/drivers/i3c/master.c
> +++ b/drivers/i3c/master.c
> @@ -1039,7 +1039,8 @@ static int i3c_master_send_ccc_cmd_locked(struct i3c_master_controller *master,
>  	if (!master->ops->send_ccc_cmd)
>  		return -EOPNOTSUPP;
>
> -	if ((cmd->id & I3C_CCC_DIRECT) && (!cmd->dests || !cmd->ndests))
> +	if ((cmd->rnw || (cmd->id & I3C_CCC_DIRECT)) &&
> +	    (!cmd->dests || !cmd->ndests))
>  		return -EINVAL;
>
>  	if (master->ops->supports_ccc_cmd &&
> --
> 2.49.GIT
>

Re: [PATCH] i3c: master: require dests for read CCC commands

[Alexandre Belloni]

On Thu, 23 Jul 2026 17:23:10 +0800, Adrian Ng Ho Yin wrote:
> Read CCC commands (rnw set) always need a destination array to store
> payload data. Extend the existing direct-CCC validation so cmd->dests
> is guaranteed non-NULL when cmd->rnw is set.

Applied, thanks!

[1/1] i3c: master: require dests for read CCC commands
      https://git.kernel.org/i3c/c/2a99006d4403

Best regards,

-- 
Alexandre Belloni, co-owner and COO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com