linux-kernel - RE: [PATCH next] wifi: iwlwifi: Fix uninitialized variable with _

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Message-ID: <MW5PR11MB581070A3B9F613677027381CA3D02@MW5PR11MB5810.namprd11.prod.outlook.com>
Date: Wed, 12 Mar 2025 09:37:09 +0000
From: "Korenblit, Miriam Rachel" <miriam.rachel.korenblit@...el.com>
To: Dan Carpenter <dan.carpenter@...aro.org>
CC: "Berg, Johannes" <johannes.berg@...el.com>, "Anjaneyulu, Pagadala Yesu"
	<pagadala.yesu.anjaneyulu@...el.com>, "Grumbach, Emmanuel"
	<emmanuel.grumbach@...el.com>, "Stern, Avraham" <avraham.stern@...el.com>,
	"Ben Shimol, Yedidya" <yedidya.ben.shimol@...el.com>, "Gabay, Daniel"
	<daniel.gabay@...el.com>, "linux-wireless@...r.kernel.org"
	<linux-wireless@...r.kernel.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "kernel-janitors@...r.kernel.org"
	<kernel-janitors@...r.kernel.org>
Subject: RE: [PATCH next] wifi: iwlwifi: Fix uninitialized variable with
 __free()



> -----Original Message-----
> From: Dan Carpenter <dan.carpenter@...aro.org>
> Sent: Wednesday, 12 March 2025 10:32
> To: Korenblit, Miriam Rachel <miriam.rachel.korenblit@...el.com>
> Cc: Berg, Johannes <johannes.berg@...el.com>; Anjaneyulu, Pagadala Yesu
> <pagadala.yesu.anjaneyulu@...el.com>; Grumbach, Emmanuel
> <emmanuel.grumbach@...el.com>; Stern, Avraham
> <avraham.stern@...el.com>; Ben Shimol, Yedidya
> <yedidya.ben.shimol@...el.com>; Gabay, Daniel <daniel.gabay@...el.com>;
> linux-wireless@...r.kernel.org; linux-kernel@...r.kernel.org; kernel-
> janitors@...r.kernel.org
> Subject: [PATCH next] wifi: iwlwifi: Fix uninitialized variable with __free()
> 
> Pointers declared with the __free(kfree) attribute need to be initialized because
> they will be passed to kfree() on every return path.  There are two return
> statement before the "cmd" pointer is initialized so this leads to an uninitialized
> variable bug.
> 
> Fixes: d1e879ec600f ("wifi: iwlwifi: add iwlmld sub-driver")
> Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
> ---
>  drivers/net/wireless/intel/iwlwifi/mld/debugfs.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/wireless/intel/iwlwifi/mld/debugfs.c
> b/drivers/net/wireless/intel/iwlwifi/mld/debugfs.c
> index c759c5c68dc0..1d4b2ad5d388 100644
> --- a/drivers/net/wireless/intel/iwlwifi/mld/debugfs.c
> +++ b/drivers/net/wireless/intel/iwlwifi/mld/debugfs.c
> @@ -556,8 +556,8 @@ iwl_dbgfs_vif_twt_setup_write(struct iwl_mld *mld, char
> *buf, size_t count,
>  	};
>  	struct ieee80211_vif *vif = data;
>  	struct iwl_mld_vif *mld_vif = iwl_mld_vif_from_mac80211(vif);
> +	struct iwl_dhc_cmd *cmd __free(kfree) = NULL;
>  	struct iwl_dhc_twt_operation *dhc_twt_cmd;
> -	struct iwl_dhc_cmd *cmd __free(kfree);
>  	u64 target_wake_time;
>  	u32 twt_operation, interval_exp, interval_mantissa, min_wake_duration;
>  	u8 trigger, flow_type, flow_id, protection, tenth_param;
> --
> 2.47.2
Acked-by: Miri Korenblit <miriam.rachel.korenblit@...el.com>