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| author | Harald Freudenberger <freude@linux.vnet.ibm.com> | 2018-03-01 16:40:00 +0100 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2018-03-18 23:02:05 -0700 |
| commit | c7260ca335a09fb186885c80bd6022318c10c541 (patch) | |
| tree | 4fb3fff6dc73c723a785ebbd80be373ad6ed076d /arch/s390 | |
| parent | c9f52c2ddb285738219ff2231a96ba3c8f5bd746 (diff) | |
| download | linux-c7260ca335a09fb186885c80bd6022318c10c541.tar.bz2 | |
s390/crypto: Fix kernel crash on aes_s390 module remove.
A kernel crash occurs when the aes_s390 kernel module is
removed on machines < z14. This only happens on kernel
version 4.15 and higher on machines not supporting MSA 8.
The reason for the crash is a unconditional
crypto_unregister_aead() invocation where no previous
crypto_register_aead() had been called. The fix now
remembers if there has been a successful registration and
only then calls the unregister function upon kernel module
remove.
The code now crashing has been introduced with
"bf7fa03 s390/crypto: add s390 platform specific aes gcm support."
Signed-off-by: Harald Freudenberger <freude@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390')
| -rw-r--r-- | arch/s390/crypto/aes_s390.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/s390/crypto/aes_s390.c b/arch/s390/crypto/aes_s390.c index d60798737d86..fa9b7dd1a513 100644 --- a/arch/s390/crypto/aes_s390.c +++ b/arch/s390/crypto/aes_s390.c @@ -1047,6 +1047,7 @@ static struct aead_alg gcm_aes_aead = { static struct crypto_alg *aes_s390_algs_ptr[5]; static int aes_s390_algs_num; +static struct aead_alg *aes_s390_aead_alg; static int aes_s390_register_alg(struct crypto_alg *alg) { @@ -1065,7 +1066,8 @@ static void aes_s390_fini(void) if (ctrblk) free_page((unsigned long) ctrblk); - crypto_unregister_aead(&gcm_aes_aead); + if (aes_s390_aead_alg) + crypto_unregister_aead(aes_s390_aead_alg); } static int __init aes_s390_init(void) @@ -1123,6 +1125,7 @@ static int __init aes_s390_init(void) ret = crypto_register_aead(&gcm_aes_aead); if (ret) goto out_err; + aes_s390_aead_alg = &gcm_aes_aead; } return 0; |