Re: [PATCH net] net/atm: fix slab-out-of-bounds read in vcc_setsockopt()

Hi Eric,

kernel test robot noticed the following build errors:

[auto build test ERROR on horms-ipvs/master]
[cannot apply to net/main net-next/main linus/master v7.2 next-20260818]
[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/Eric-Dumazet/net-atm-fix-slab-out-of-bounds-read-in-vcc_setsockopt/20260804-145806
base:   https://git.kernel.org/pub/scm/linux/kernel/git/horms/ipvs.git master
patch link:    https://lore.kernel.org/r/20260804145806.2112004-1-edumazet%40google.com
patch subject: [PATCH net] net/atm: fix slab-out-of-bounds read in vcc_setsockopt()
config: alpha-allmodconfig (https://download.01.org/0day-ci/archive/20260820/[email protected]/config)
compiler: alpha-linux-gcc (GCC) 16.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260820/[email protected]/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 <[email protected]>
| Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/

All errors (new ones prefixed by >>):

   net/atm/common.c: In function 'vcc_setsockopt':
>> net/atm/common.c:763:25: error: implicit declaration of function 'copy_safe_from_sockptr'; did you mean 'copy_from_sockptr'? [-Wimplicit-function-declaration]
     763 |                 error = copy_safe_from_sockptr(&qos, sizeof(qos), optval, optlen);
         |                         ^~~~~~~~~~~~~~~~~~~~~~
         |                         copy_from_sockptr


vim +763 net/atm/common.c

   746	
   747	int vcc_setsockopt(struct socket *sock, int level, int optname,
   748			   sockptr_t optval, unsigned int optlen)
   749	{
   750		struct atm_vcc *vcc;
   751		unsigned long value;
   752		int error;
   753	
   754		if (__SO_LEVEL_MATCH(optname, level) && optlen != __SO_SIZE(optname))
   755			return -EINVAL;
   756	
   757		vcc = ATM_SD(sock);
   758		switch (optname) {
   759		case SO_ATMQOS:
   760		{
   761			struct atm_qos qos;
   762	
 > 763			error = copy_safe_from_sockptr(&qos, sizeof(qos), optval, optlen);
   764			if (error)
   765				return error;
   766			error = check_qos(&qos);
   767			if (error)
   768				return error;
   769			if (sock->state == SS_CONNECTED)
   770				return atm_change_qos(vcc, &qos);
   771			if (sock->state != SS_UNCONNECTED)
   772				return -EBADFD;
   773			vcc->qos = qos;
   774			set_bit(ATM_VF_HASQOS, &vcc->flags);
   775			return 0;
   776		}
   777		case SO_SETCLP:
   778			error = copy_safe_from_sockptr(&value, sizeof(value), optval, optlen);
   779			if (error)
   780				return error;
   781			if (value)
   782				vcc->atm_options |= ATM_ATMOPT_CLP;
   783			else
   784				vcc->atm_options &= ~ATM_ATMOPT_CLP;
   785			return 0;
   786		default:
   787			return -EINVAL;
   788		}
   789	}
   790	

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