Commit 4f57ba71 authored by Ingo Tuchscherer's avatar Ingo Tuchscherer Committed by Martin Schwidefsky

s390/crypto: fix aes_s390 crypto module unload problem

If a machine has no hardware support for the xts-aes or ctr-aes algorithms
they are not registered in aes_s390_init. But aes_s390_fini unconditionally
unregisters the algorithms which causes crypto_remove_alg to crash.
Add two flag variables to remember if xts-aes and ctr-aes have been added.
Signed-off-by: default avatarIngo Tuchscherer <ingo.tuchscherer@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent dc3ac5ff
......@@ -725,6 +725,8 @@ static struct crypto_alg xts_aes_alg = {
}
};
static int xts_aes_alg_reg;
static int ctr_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
unsigned int key_len)
{
......@@ -846,6 +848,8 @@ static struct crypto_alg ctr_aes_alg = {
}
};
static int ctr_aes_alg_reg;
static int __init aes_s390_init(void)
{
int ret;
......@@ -884,6 +888,7 @@ static int __init aes_s390_init(void)
ret = crypto_register_alg(&xts_aes_alg);
if (ret)
goto xts_aes_err;
xts_aes_alg_reg = 1;
}
if (crypt_s390_func_available(KMCTR_AES_128_ENCRYPT,
......@@ -902,6 +907,7 @@ static int __init aes_s390_init(void)
free_page((unsigned long) ctrblk);
goto ctr_aes_err;
}
ctr_aes_alg_reg = 1;
}
out:
......@@ -921,9 +927,12 @@ static int __init aes_s390_init(void)
static void __exit aes_s390_fini(void)
{
crypto_unregister_alg(&ctr_aes_alg);
free_page((unsigned long) ctrblk);
crypto_unregister_alg(&xts_aes_alg);
if (ctr_aes_alg_reg) {
crypto_unregister_alg(&ctr_aes_alg);
free_page((unsigned long) ctrblk);
}
if (xts_aes_alg_reg)
crypto_unregister_alg(&xts_aes_alg);
crypto_unregister_alg(&cbc_aes_alg);
crypto_unregister_alg(&ecb_aes_alg);
crypto_unregister_alg(&aes_alg);
......
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