[android-common:android17-6.18-2026-09 1/1] net/ipv4/fib_trie.c:320:13: warning: implicit conversion from 'unsigned long' to 'u32' (aka 'unsigned int') changes value from 2305843009213693946 to 4294967290

[kernel test robot <lkp@intel.com>]

tree:   https://android.googlesource.com/kernel/common android17-6.18-2026-09
head:   a69319c19fd01d6ddb506d4e39b1e50451bdb352
commit: 3e1da3739d68558bacc60ea5f469fbddaf529c32 [1/1] ANDROID: GKI: Add GKI_HIDDEN_XFRM_OFFLOAD_CONFIGS
config: x86_64-randconfig-2001-20261029 (https://download.01.org/0day-ci/archive/20261029/202610291501.qubtmNJx-lkp@intel.com/config)
compiler: clang version 22.1.8 (https://github.com/llvm/llvm-project ca7933e47d3a3451d81e72ac174dcb5aa28b59d1)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20261029/202610291501.qubtmNJx-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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202610291501.qubtmNJx-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from <built-in>:3:
   In file included from include/linux/compiler_types.h:171:
   include/linux/compiler-clang.h:28:9: warning: '__SANITIZE_ADDRESS__' macro redefined [-Wmacro-redefined]
      28 | #define __SANITIZE_ADDRESS__
         |         ^
   <built-in>:353:9: note: previous definition is here
     353 | #define __SANITIZE_ADDRESS__ 1
         |         ^
   In file included from net/ipv4/fib_trie.c:69:
   In file included from include/net/tcp.h:45:
   include/net/xfrm.h:2088:30: error: no member named 'xfrm' in 'struct dst_entry'
    2088 |         struct xfrm_state *x = dst->xfrm;
         |                                ~~~  ^
   include/net/xfrm.h:2095:46: error: no member named 'xfrm' in 'struct dst_entry'
    2095 |         if (!x->xso.offload_handle && !xdst->child->xfrm)
         |                                        ~~~~~~~~~~~  ^
   include/net/xfrm.h:2098:20: error: no member named 'xfrm' in 'struct dst_entry'
    2098 |             !xdst->child->xfrm)
         |              ~~~~~~~~~~~  ^
>> net/ipv4/fib_trie.c:320:13: warning: implicit conversion from 'unsigned long' to 'u32' (aka 'unsigned int') changes value from 2305843009213693946 to 4294967290 [-Wconstant-conversion]
     320 |         if (bits > TNODE_VMALLOC_MAX)
         |                    ^~~~~~~~~~~~~~~~~
   net/ipv4/fib_trie.c:301:35: note: expanded from macro 'TNODE_VMALLOC_MAX'
     301 |         ilog2((SIZE_MAX - TNODE_SIZE(0)) / sizeof(struct key_vector *))
         |         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/log2.h:162:14: note: expanded from macro 'ilog2'
     162 |         __ilog2_u32(n) :                \
         |         ~~~~~~~~~~~ ^
   2 warnings and 3 errors generated.

Kconfig warnings: (for reference only)
   WARNING: unmet direct dependencies detected for CAN_RX_OFFLOAD
   Depends on [n]: NETDEVICES [=y] && CAN_DEV [=n] && CAN_NETLINK [=n]
   Selected by [y]:
   - GKI_HIDDEN_MCP251XFD_CONFIGS [=y]


vim +320 net/ipv4/fib_trie.c

37fd30f2da573c Alexander Duyck   2014-12-31  314  
dc35dbeda3e00a Alexander Duyck   2015-03-06  315  static struct tnode *tnode_alloc(int bits)
f0e36f8cee8101 Patrick McHardy   2005-07-05  316  {
1de3d87bcd2c2e Alexander Duyck   2015-03-04  317  	size_t size;
1de3d87bcd2c2e Alexander Duyck   2015-03-04  318  
1de3d87bcd2c2e Alexander Duyck   2015-03-04  319  	/* verify bits is within bounds */
1de3d87bcd2c2e Alexander Duyck   2015-03-04 @320  	if (bits > TNODE_VMALLOC_MAX)
1de3d87bcd2c2e Alexander Duyck   2015-03-04  321  		return NULL;
1de3d87bcd2c2e Alexander Duyck   2015-03-04  322  
1de3d87bcd2c2e Alexander Duyck   2015-03-04  323  	/* determine size and verify it is non-zero and didn't overflow */
1de3d87bcd2c2e Alexander Duyck   2015-03-04  324  	size = TNODE_SIZE(1ul << bits);
1de3d87bcd2c2e Alexander Duyck   2015-03-04  325  
2373ce1ca04dd4 Robert Olsson     2005-08-25  326  	if (size <= PAGE_SIZE)
8d96544475b236 Eric Dumazet      2008-01-13  327  		return kzalloc(size, GFP_KERNEL);
15be75cdb5db44 Stephen Hemminger 2008-04-10  328  	else
7a1c8e5ab120a5 Eric Dumazet      2010-11-20  329  		return vzalloc(size);
15be75cdb5db44 Stephen Hemminger 2008-04-10  330  }
2373ce1ca04dd4 Robert Olsson     2005-08-25  331  

:::::: The code at line 320 was first introduced by commit
:::::: 1de3d87bcd2c2e631500b9e4f0c40b38ce0d0d57 fib_trie: Prevent allocating tnode if bits is too big for size_t

:::::: TO: Alexander Duyck <alexander.h.duyck@redhat.com>
:::::: CC: David S. Miller <davem@davemloft.net>

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