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lib/digsig: checks for NULL return value

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mpi_read_from_buffer() return value must not be NULL.

Signed-off-by: Dmitry Kasatkin <dmitry.kasatkin@intel.com>
Reviewed-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: James Morris <jmorris@namei.org>
This commit is contained in:
Dmitry Kasatkin 2012-01-26 19:13:24 +02:00 committed by James Morris
parent 43b2c0aeaa
commit 86f8bedc9e
1 changed files with 6 additions and 2 deletions
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8
lib/digsig.c
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@ -109,9 +109,13 @@ static int digsig_verify_rsa(struct key *key,
datap = pkh->mpi; datap = pkh->mpi;
endp = ukp->data + ukp->datalen; endp = ukp->data + ukp->datalen;
err = -ENOMEM;
for (i = 0; i < pkh->nmpi; i++) { for (i = 0; i < pkh->nmpi; i++) {
unsigned int remaining = endp - datap; unsigned int remaining = endp - datap;
pkey[i] = mpi_read_from_buffer(datap, &remaining); pkey[i] = mpi_read_from_buffer(datap, &remaining);
if (!pkey[i])
goto err;
datap += remaining; datap += remaining;
} }
@ -168,8 +172,8 @@ err:
mpi_free(res); mpi_free(res);
kfree(out1); kfree(out1);
kfree(out2); kfree(out2);
mpi_free(pkey[0]); while (--i >= 0)
mpi_free(pkey[1]); mpi_free(pkey[i]);
err1: err1:
up_read(&key->sem); up_read(&key->sem);