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lib/digsig: digsig_verify_rsa(): return -EINVAL if modulo length is zero

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Currently, if digsig_verify_rsa() detects that the modulo's length is zero,
i.e. mlen == 0, it returns -ENOMEM which doesn't really fit here.

Make digsig_verify_rsa() return -EINVAL upon mlen == 0.

Signed-off-by: Nicolai Stange <nicstange@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Nicolai Stange 2016-05-26 23:19:52 +02:00 committed by Herbert Xu
parent 03cdfaad49
commit c5ce7c697c
1 changed files with 5 additions and 3 deletions
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8
lib/digsig.c
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@ -114,13 +114,15 @@ static int digsig_verify_rsa(struct key *key,
datap += remaining;
}
err = -ENOMEM;
mblen = mpi_get_nbits(pkey[0]);
mlen = DIV_ROUND_UP(mblen, 8);
if (mlen == 0)
if (mlen == 0) {
err = -EINVAL;
goto err;
}
err = -ENOMEM;
out1 = kzalloc(mlen, GFP_KERNEL);
if (!out1)