Re: [PATCH] SUNRPC: Reject short RFC 4121 MIC tokens in gss_krb5_verify_mic_v2

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

Hi Chuck,

[This is a private test report for your RFC patch.]
kernel test robot noticed the following build errors:

[auto build test ERROR on trondmy-nfs/linux-next]
[also build test ERROR on linus/master v7.1-rc5 next-20260522]
[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
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Chuck-Lever/SUNRPC-Reject-short-RFC-4121-MIC-tokens-in-gss_krb5_verify_mic_v2/20260524-005345
base:   git://git.linux-nfs.org/projects/trondmy/linux-nfs.git linux-next
patch link:    https://lore.kernel.org/r/20260523165237.510204-1-cel%40kernel.org
patch subject: [PATCH] SUNRPC: Reject short RFC 4121 MIC tokens in gss_krb5_verify_mic_v2
config: sh-allmodconfig (https://download.01.org/0day-ci/archive/20260526/202605260025.iqHX0Pwi-lkp@intel.com/config)
compiler: sh4-linux-gcc (GCC) 15.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260526/202605260025.iqHX0Pwi-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/202605260025.iqHX0Pwi-lkp@intel.com/

All errors (new ones prefixed by >>):

   net/sunrpc/auth_gss/gss_krb5_unseal.c: In function 'gss_krb5_verify_mic_v2':
>> net/sunrpc/auth_gss/gss_krb5_unseal.c:89:54: error: 'cksum_len' undeclared (first use in this function)
      89 |         if (read_token->len < GSS_KRB5_TOK_HDR_LEN + cksum_len)
         |                                                      ^~~~~~~~~
   net/sunrpc/auth_gss/gss_krb5_unseal.c:89:54: note: each undeclared identifier is reported only once for each function it appears in


vim +/cksum_len +89 net/sunrpc/auth_gss/gss_krb5_unseal.c

    69	
    70	u32
    71	gss_krb5_verify_mic_v2(struct krb5_ctx *ctx, struct xdr_buf *message_buffer,
    72			       struct xdr_netobj *read_token)
    73	{
    74		struct crypto_ahash *tfm = ctx->initiate ?
    75					   ctx->acceptor_sign : ctx->initiator_sign;
    76		char cksumdata[GSS_KRB5_MAX_CKSUM_LEN];
    77		struct xdr_netobj cksumobj = {
    78			.len	= ctx->gk5e->cksumlength,
    79			.data	= cksumdata,
    80		};
    81		u8 *ptr = read_token->data;
    82		__be16 be16_ptr;
    83		time64_t now;
    84		u8 flags;
    85		int i;
    86	
    87		dprintk("RPC:       %s\n", __func__);
    88	
  > 89		if (read_token->len < GSS_KRB5_TOK_HDR_LEN + cksum_len)

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