linux-kernel - Re: [PATCH] net: atm: lec: add pre_send validation to avoid uninitialized

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Message-ID: <202512080911.BLjFHfAd-lkp@intel.com>
Date: Mon, 8 Dec 2025 10:12:54 +0800
From: kernel test robot <lkp@...el.com>
To: Dharanitharan R <dharanitharan725@...il.com>,
	syzbot+5dd615f890ddada54057@...kaller.appspotmail.com
Cc: oe-kbuild-all@...ts.linux.dev, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Dharanitharan R <dharanitharan725@...il.com>
Subject: Re: [PATCH] net: atm: lec: add pre_send validation to avoid
 uninitialized

Hi Dharanitharan,

kernel test robot noticed the following build warnings:

[auto build test WARNING on net/main]
[also build test WARNING on net-next/main linus/master horms-ipvs/master v6.18 next-20251205]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Dharanitharan-R/net-atm-lec-add-pre_send-validation-to-avoid-uninitialized/20251207-121647
base:   net/main
patch link:    https://lore.kernel.org/r/20251207041453.8302-1-dharanitharan725%40gmail.com
patch subject: [PATCH] net: atm: lec: add pre_send validation to avoid uninitialized
config: nios2-randconfig-002-20251208 (https://download.01.org/0day-ci/archive/20251208/202512080911.BLjFHfAd-lkp@intel.com/config)
compiler: nios2-linux-gcc (GCC) 11.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251208/202512080911.BLjFHfAd-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202512080911.BLjFHfAd-lkp@intel.com/

All warnings (new ones prefixed by >>):

   net/atm/lec.c: In function 'lec_atm_pre_send':
>> net/atm/lec.c:503:4: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
     503 |    if (!pskb_may_pull(skb, msg_size))
         |    ^~
   net/atm/lec.c:506:9: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
     506 |         mesg = (struct atmlec_msg *)skb->data;
         |         ^~~~

Kconfig warnings: (for reference only)
   WARNING: unmet direct dependencies detected for CAN_DEV
   Depends on [n]: NETDEVICES [=n] && CAN [=m]
   Selected by [m]:
   - CAN [=m] && NET [=y]


vim +/if +503 net/atm/lec.c

   491	
   492	static int lec_atm_pre_send(struct atm_vcc *vcc, struct sk_buff *skb)
   493	{
   494		struct atmlec_msg *mesg;
   495		u32 sizeoftlvs;
   496		unsigned int msg_size = sizeof(struct atmlec_msg);
   497	
   498		/* Must contain the base message */
   499		if (skb->len < msg_size)
   500			return -EINVAL;
   501	
   502	   /* Must have at least msg_size bytes in linear data */
 > 503	   if (!pskb_may_pull(skb, msg_size))
   504	   	return -EINVAL;
   505	
   506		mesg = (struct atmlec_msg *)skb->data;
   507	   sizeoftlvs = mesg->sizeoftlvs;
   508	
   509	   /* Validate TLVs if present */
   510	   if (sizeoftlvs && !pskb_may_pull(skb, msg_size + sizeoftlvs))
   511	       return -EINVAL;
   512	
   513	   return 0;
   514	}
   515	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki