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SubjectRe: [PATCH] net: ipv6: fix slab-out-of-bounds Read in __xfrm6_tunnel_spi_check
Hi K,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on ipsec/master]
[also build test WARNING on ipsec-next/master net-next/master net/master v5.8-rc6 next-20200724]
[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]

base: master
config: x86_64-randconfig-r032-20200726 (attached as .config)
compiler: clang version 12.0.0 ( 8bf4c1f4fb257774f66c8cda07adc6c5e8668326)
reproduce (this is a W=1 build):
wget -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# install x86_64 cross compiling tool for clang build
# apt-get install binutils-x86-64-linux-gnu
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <>

All warnings (new ones prefixed by >>):

>> net/ipv6/xfrm6_tunnel.c:106:43: warning: incompatible integer to pointer conversion passing 'u32' (aka 'unsigned int') to parameter of type 'const xfrm_address_t *' [-Wint-conversion]
int index = xfrm6_tunnel_spi_hash_byaddr(spi);
net/ipv6/xfrm6_tunnel.c:57:79: note: passing argument to parameter 'addr' here
static inline unsigned int xfrm6_tunnel_spi_hash_byaddr(const xfrm_address_t *addr)
net/ipv6/xfrm6_tunnel.c:69:28: warning: unused function 'xfrm6_tunnel_spi_hash_byspi' [-Wunused-function]
static inline unsigned int xfrm6_tunnel_spi_hash_byspi(u32 spi)
2 warnings generated.

vim +106 net/ipv6/xfrm6_tunnel.c

102 static int __xfrm6_tunnel_spi_check(struct net *net, u32 spi)
103 {
104 struct xfrm6_tunnel_net *xfrm6_tn = xfrm6_tunnel_pernet(net);
105 struct xfrm6_tunnel_spi *x6spi;
> 106 int index = xfrm6_tunnel_spi_hash_byaddr(spi);
108 hlist_for_each_entry(x6spi,
109 &xfrm6_tn->spi_byaddr[index],
110 list_byspi) {
111 if (x6spi->spi == spi)
112 return -1;
113 }
114 return index;
115 }

0-DAY CI Kernel Test Service, Intel Corporation
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