CC: [email protected]
CC: Linux Memory Management List <[email protected]>
TO: Vladimir Oltean <[email protected]>

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git 
master
head:   8d4b477da1a807199ca60e0829357ce7aa6758d5
commit: 04a1758348a87eb73b8a4554d0c227831e2bb33e [4175/4668] net: dsa: 
tag_sja1105: fix control packets on SJA1110 being received on an imprecise port
:::::: branch date: 19 hours ago
:::::: commit date: 2 days ago
config: i386-randconfig-m021-20210730 (attached as .config)
compiler: gcc-10 (Ubuntu 10.3.0-1ubuntu1~20.04) 10.3.0

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <[email protected]>
Reported-by: Dan Carpenter <[email protected]>

smatch warnings:
net/dsa/tag_sja1105.c:564 sja1110_rcv() error: uninitialized symbol 'vid'.

vim +/vid +564 net/dsa/tag_sja1105.c

4913b8ebf8a9c5 Vladimir Oltean 2021-06-11  542  
4913b8ebf8a9c5 Vladimir Oltean 2021-06-11  543  static struct sk_buff 
*sja1110_rcv(struct sk_buff *skb,
4913b8ebf8a9c5 Vladimir Oltean 2021-06-11  544                                  
   struct net_device *netdev,
4913b8ebf8a9c5 Vladimir Oltean 2021-06-11  545                                  
   struct packet_type *pt)
4913b8ebf8a9c5 Vladimir Oltean 2021-06-11  546  {
0fac6aa098edf9 Vladimir Oltean 2021-07-19  547          int source_port = -1, 
switch_id = -1;
884be12f85666c Vladimir Oltean 2021-07-26  548          u16 vid;
4913b8ebf8a9c5 Vladimir Oltean 2021-06-11  549  
4913b8ebf8a9c5 Vladimir Oltean 2021-06-11  550          skb->offload_fwd_mark = 
1;
4913b8ebf8a9c5 Vladimir Oltean 2021-06-11  551  
4913b8ebf8a9c5 Vladimir Oltean 2021-06-11  552          if 
(sja1110_skb_has_inband_control_extension(skb)) {
4913b8ebf8a9c5 Vladimir Oltean 2021-06-11  553                  skb = 
sja1110_rcv_inband_control_extension(skb, &source_port,
4913b8ebf8a9c5 Vladimir Oltean 2021-06-11  554                                  
                           &switch_id);
4913b8ebf8a9c5 Vladimir Oltean 2021-06-11  555                  if (!skb)
4913b8ebf8a9c5 Vladimir Oltean 2021-06-11  556                          return 
NULL;
4913b8ebf8a9c5 Vladimir Oltean 2021-06-11  557          }
4913b8ebf8a9c5 Vladimir Oltean 2021-06-11  558  
4913b8ebf8a9c5 Vladimir Oltean 2021-06-11  559          /* Packets with in-band 
control extensions might still have RX VLANs */
4913b8ebf8a9c5 Vladimir Oltean 2021-06-11  560          if 
(likely(sja1105_skb_has_tag_8021q(skb)))
04a1758348a87e Vladimir Oltean 2021-07-29  561                  
sja1105_vlan_rcv(skb, &source_port, &switch_id, &vid);
4913b8ebf8a9c5 Vladimir Oltean 2021-06-11  562  
04a1758348a87e Vladimir Oltean 2021-07-29  563          if (source_port == -1 
|| switch_id == -1)
884be12f85666c Vladimir Oltean 2021-07-26 @564                  skb->dev = 
dsa_find_designated_bridge_port_by_vid(netdev, vid);
884be12f85666c Vladimir Oltean 2021-07-26  565          else
4913b8ebf8a9c5 Vladimir Oltean 2021-06-11  566                  skb->dev = 
dsa_master_find_slave(netdev, switch_id, source_port);
4913b8ebf8a9c5 Vladimir Oltean 2021-06-11  567          if (!skb->dev) {
884be12f85666c Vladimir Oltean 2021-07-26  568                  
netdev_warn(netdev, "Couldn't decode source port\n");
4913b8ebf8a9c5 Vladimir Oltean 2021-06-11  569                  return NULL;
4913b8ebf8a9c5 Vladimir Oltean 2021-06-11  570          }
4913b8ebf8a9c5 Vladimir Oltean 2021-06-11  571  
4913b8ebf8a9c5 Vladimir Oltean 2021-06-11  572          return skb;
4913b8ebf8a9c5 Vladimir Oltean 2021-06-11  573  }
4913b8ebf8a9c5 Vladimir Oltean 2021-06-11  574  

:::::: The code at line 564 was first introduced by commit
:::::: 884be12f85666c6e9ff1cf3ead06a7371f6863dc net: dsa: sja1105: add support 
for imprecise RX

:::::: TO: Vladimir Oltean <[email protected]>
:::::: CC: David S. Miller <[email protected]>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/[email protected]

Attachment: .config.gz
Description: application/gzip

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