* [jpirko-mlxsw:jiri_devel_xmrouter 11/26] drivers/net/ethernet/mellanox/mlxsw/spectrum_router_xm.c:289:55: warning: Either the condition '!fib_entry' is redundant or there is possible null pointer dereference: fib_entry.
@ 2020-10-21 19:01 kernel test robot
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From: kernel test robot @ 2020-10-21 19:01 UTC (permalink / raw)
To: kbuild
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CC: kbuild-all(a)lists.01.org
TO: Jiri Pirko <jiri@nvidia.com>
tree: https://github.com/jpirko/linux_mlxsw jiri_devel_xmrouter
head: c452ac0a6496122cc1fcd4f54e3fca1631ac6427
commit: a85ae9826ed2a51277b63beae8413410db09ddae [11/26] mlxsw: spectrum_router_xm: Implement L-value tracking for M-index
:::::: branch date: 12 hours ago
:::::: commit date: 12 hours ago
compiler: ia64-linux-gcc (GCC) 9.3.0
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>
cppcheck possible warnings: (new ones prefixed by >>, may not real problems)
>> drivers/net/ethernet/mellanox/mlxsw/spectrum_router_xm.c:289:55: warning: Either the condition '!fib_entry' is redundant or there is possible null pointer dereference: fib_entry. [nullPointerRedundantCheck]
struct mlxsw_sp_router_xm_ltable_node *ltable_node = fib_entry->ltable_node;
^
drivers/net/ethernet/mellanox/mlxsw/spectrum_router_xm.c:293:6: note: Assuming that condition '!fib_entry' is not redundant
if (!fib_entry || !fib_entry->ltable_node)
^
drivers/net/ethernet/mellanox/mlxsw/spectrum_router_xm.c:289:55: note: Null pointer dereference
struct mlxsw_sp_router_xm_ltable_node *ltable_node = fib_entry->ltable_node;
^
drivers/net/ethernet/mellanox/mlxsw/spectrum_router_xm.c:291:14: warning: Either the condition '!fib_entry' is redundant or there is possible null pointer dereference: fib_entry. [nullPointerRedundantCheck]
u8 lvalue = fib_entry->lvalue;
^
drivers/net/ethernet/mellanox/mlxsw/spectrum_router_xm.c:293:6: note: Assuming that condition '!fib_entry' is not redundant
if (!fib_entry || !fib_entry->ltable_node)
^
drivers/net/ethernet/mellanox/mlxsw/spectrum_router_xm.c:291:14: note: Null pointer dereference
u8 lvalue = fib_entry->lvalue;
^
vim +289 drivers/net/ethernet/mellanox/mlxsw/spectrum_router_xm.c
a85ae9826ed2a51 Jiri Pirko 2020-07-17 285
a85ae9826ed2a51 Jiri Pirko 2020-07-17 286 static void mlxsw_sp_router_xm_ml_entry_del(struct mlxsw_sp *mlxsw_sp,
a85ae9826ed2a51 Jiri Pirko 2020-07-17 287 struct mlxsw_sp_router_xm_fib_entry *fib_entry)
a85ae9826ed2a51 Jiri Pirko 2020-07-17 288 {
a85ae9826ed2a51 Jiri Pirko 2020-07-17 @289 struct mlxsw_sp_router_xm_ltable_node *ltable_node = fib_entry->ltable_node;
a85ae9826ed2a51 Jiri Pirko 2020-07-17 290 struct mlxsw_sp_router_xm *router_xm = mlxsw_sp->router->xm;
a85ae9826ed2a51 Jiri Pirko 2020-07-17 291 u8 lvalue = fib_entry->lvalue;
a85ae9826ed2a51 Jiri Pirko 2020-07-17 292
a85ae9826ed2a51 Jiri Pirko 2020-07-17 293 if (!fib_entry || !fib_entry->ltable_node)
a85ae9826ed2a51 Jiri Pirko 2020-07-17 294 return;
a85ae9826ed2a51 Jiri Pirko 2020-07-17 295
a85ae9826ed2a51 Jiri Pirko 2020-07-17 296 ltable_node->lvalue_ref[lvalue]--;
a85ae9826ed2a51 Jiri Pirko 2020-07-17 297 if (lvalue == ltable_node->current_lvalue && lvalue &&
a85ae9826ed2a51 Jiri Pirko 2020-07-17 298 !ltable_node->lvalue_ref[lvalue]) {
a85ae9826ed2a51 Jiri Pirko 2020-07-17 299 u8 new_lvalue = lvalue - 1;
a85ae9826ed2a51 Jiri Pirko 2020-07-17 300
a85ae9826ed2a51 Jiri Pirko 2020-07-17 301 /* Find the biggest L-value left out there. */
a85ae9826ed2a51 Jiri Pirko 2020-07-17 302 while (new_lvalue > 0 && !ltable_node->lvalue_ref[lvalue])
a85ae9826ed2a51 Jiri Pirko 2020-07-17 303 new_lvalue--;
a85ae9826ed2a51 Jiri Pirko 2020-07-17 304
a85ae9826ed2a51 Jiri Pirko 2020-07-17 305 ltable_node->current_lvalue = new_lvalue;
a85ae9826ed2a51 Jiri Pirko 2020-07-17 306 mlxsw_sp_router_xm_ltable_lvalue_set(mlxsw_sp, ltable_node);
a85ae9826ed2a51 Jiri Pirko 2020-07-17 307 }
a85ae9826ed2a51 Jiri Pirko 2020-07-17 308
a85ae9826ed2a51 Jiri Pirko 2020-07-17 309 mlxsw_sp_router_xm_ltable_node_put(router_xm, ltable_node);
a85ae9826ed2a51 Jiri Pirko 2020-07-17 310 }
a85ae9826ed2a51 Jiri Pirko 2020-07-17 311
---
0-DAY CI Kernel Test Service, Intel Corporation
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2020-10-21 19:01 [jpirko-mlxsw:jiri_devel_xmrouter 11/26] drivers/net/ethernet/mellanox/mlxsw/spectrum_router_xm.c:289:55: warning: Either the condition '!fib_entry' is redundant or there is possible null pointer dereference: fib_entry kernel test robot
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