[digsig:working 47/64] security/integrity/digsig.c:74:1: warning: 'shash_digest' uses dynamic stack

[Fengguang Wu <fengguang.wu@intel.com>]

Hi Dmitry,

I'm not sure if the warned 'dynamic stack allocation' is relevant, but
as an FYI:

tree:   git://git.kernel.org/pub/scm/linux/kernel/git/kasatkin/linux-digsig.git working
head:   ca88a6aa648a167b6f8e5666518249635510b0b0
commit: c6a28f9ee92fe96c5a7c4e5989eb7ae06b545469 [47/64] integrity: added digest calculation function
config: s390-allyesconfig

All error/warnings:

security/integrity/digsig.c: In function 'shash_digest':
security/integrity/digsig.c:74:1: warning: 'shash_digest' uses dynamic stack allocation [enabled by default]

vim +74 security/integrity/digsig.c
    64			char ctx[crypto_shash_descsize(tfm)];
    65		} desc;
    66	
    67		desc.shash.tfm = tfm;
    68		desc.shash.flags = 0;
    69	
    70		rc = crypto_shash_digest(&desc.shash, data, len, digest);
    71		if (!rc)
    72			rc = crypto_shash_digestsize(tfm);
    73		return rc;
  > 74	}
    75	
    76	/**
    77	 * integrity_calc_digest() - digest calculation
    78	 * @algo:	digest algo id (enum digest_algo)
    79	 * @data:	data
    80	 * @len:	length of the data
    81	 * @digest:	digest
    82	 * @return:	digest length on success, -EINVAL otherwise
    83	 *
    84	 * Calculates digest of the data.

---
0-DAY kernel build testing backend         Open Source Technology Centre
Fengguang Wu <wfg@linux.intel.com>                     Intel Corporation