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s390/crypto: Fix return code checking in cbc_paes_crypt()

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The return code of cpacf_kmc() is less than the number of
bytes to process in case of an error, not greater.
The crypt routines for the other cipher modes already have
this correctly.

Cc: stable@vger.kernel.org # v4.11+
Fixes: 2793784307 ("s390/crypt: Add protected key AES module")
Signed-off-by: Ingo Franzki <ifranzki@linux.ibm.com>
Acked-by: Harald Freudenberger <freude@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Ingo Franzki 2018-08-27 14:28:47 +02:00 • committed by Martin Schwidefsky
parent 60c1f89241
commit b81126e01a
1 changed files with 1 additions and 1 deletions
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2
arch/s390/crypto/paes_s390.c
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@ -208,7 +208,7 @@ static int cbc_paes_crypt(struct blkcipher_desc *desc, unsigned long modifier,
walk->dst.virt.addr, walk->src.virt.addr, n);
if (k)
ret = blkcipher_walk_done(desc, walk, nbytes - k);
if (n < k) {
if (k < n) {
if (__cbc_paes_set_key(ctx) != 0)
return blkcipher_walk_done(desc, walk, -EIO);
memcpy(param.key, ctx->pk.protkey, MAXPROTKEYSIZE);