tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 
master
head:   4d41ead6ead97c3730bbd186a601a64828668f01
commit: 2cafa72e516f61b6d82c2416b4f5963fb48fd9ce net: dsa: sja1105: add a new 
best_effort_vlan_filtering devlink parameter
config: arm-randconfig-m031-20200829 (attached as .config)
compiler: arm-linux-gnueabi-gcc (GCC) 9.3.0

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <l...@intel.com>
Reported-by: Dan Carpenter <dan.carpen...@oracle.com>

New smatch warnings:
drivers/net/dsa/sja1105/sja1105_main.c:2342 
sja1105_best_effort_vlan_filtering_set() error: uninitialized symbol 'rc'.

# 
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=2cafa72e516f61b6d82c2416b4f5963fb48fd9ce
git remote add linus 
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout 2cafa72e516f61b6d82c2416b4f5963fb48fd9ce
vim +/rc +2342 drivers/net/dsa/sja1105/sja1105_main.c

2cafa72e516f61 Vladimir Oltean 2020-05-12  2316  static int 
sja1105_best_effort_vlan_filtering_set(struct sja1105_private *priv,
2cafa72e516f61 Vladimir Oltean 2020-05-12  2317                                 
                  bool be_vlan)
2cafa72e516f61 Vladimir Oltean 2020-05-12  2318  {
2cafa72e516f61 Vladimir Oltean 2020-05-12  2319         struct dsa_switch *ds = 
priv->ds;
2cafa72e516f61 Vladimir Oltean 2020-05-12  2320         bool vlan_filtering;
2cafa72e516f61 Vladimir Oltean 2020-05-12  2321         int port;
2cafa72e516f61 Vladimir Oltean 2020-05-12  2322         int rc;
2cafa72e516f61 Vladimir Oltean 2020-05-12  2323  
2cafa72e516f61 Vladimir Oltean 2020-05-12  2324         
priv->best_effort_vlan_filtering = be_vlan;
2cafa72e516f61 Vladimir Oltean 2020-05-12  2325  
2cafa72e516f61 Vladimir Oltean 2020-05-12  2326         rtnl_lock();
2cafa72e516f61 Vladimir Oltean 2020-05-12  2327         for (port = 0; port < 
ds->num_ports; port++) {
2cafa72e516f61 Vladimir Oltean 2020-05-12  2328                 struct dsa_port 
*dp;
2cafa72e516f61 Vladimir Oltean 2020-05-12  2329  
2cafa72e516f61 Vladimir Oltean 2020-05-12  2330                 if 
(!dsa_is_user_port(ds, port))
2cafa72e516f61 Vladimir Oltean 2020-05-12  2331                         
continue;

What if ds->num_ports is zero or they're all user ports?

2cafa72e516f61 Vladimir Oltean 2020-05-12  2332  
2cafa72e516f61 Vladimir Oltean 2020-05-12  2333                 dp = 
dsa_to_port(ds, port);
2cafa72e516f61 Vladimir Oltean 2020-05-12  2334                 vlan_filtering 
= dsa_port_is_vlan_filtering(dp);
2cafa72e516f61 Vladimir Oltean 2020-05-12  2335  
2cafa72e516f61 Vladimir Oltean 2020-05-12  2336                 rc = 
sja1105_vlan_filtering(ds, port, vlan_filtering);
2cafa72e516f61 Vladimir Oltean 2020-05-12  2337                 if (rc)
2cafa72e516f61 Vladimir Oltean 2020-05-12  2338                         break;
2cafa72e516f61 Vladimir Oltean 2020-05-12  2339         }
2cafa72e516f61 Vladimir Oltean 2020-05-12  2340         rtnl_unlock();
2cafa72e516f61 Vladimir Oltean 2020-05-12  2341  
2cafa72e516f61 Vladimir Oltean 2020-05-12 @2342         return rc;
                                                        ^^^^^^^^^

2cafa72e516f61 Vladimir Oltean 2020-05-12  2343  }

---
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