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s390/zcrypt: Fixed possible race condition in zcrypt module handling

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Signed-off-by: Ingo Tuchscherer <ingo.tuchscherer@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Ingo Tuchscherer 2014-09-16 14:37:25 +02:00 committed by Martin Schwidefsky
parent 9fc98ad0d2
commit 46b05c7bd5
1 changed files with 3 additions and 4 deletions
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7
drivers/s390/crypto/zcrypt_api.c
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@ -343,10 +343,11 @@ struct zcrypt_ops *__ops_lookup(unsigned char *name, int variant)
break; break;
} }
} }
if (!found || !try_module_get(zops->owner))
zops = NULL;
spin_unlock_bh(&zcrypt_ops_list_lock); spin_unlock_bh(&zcrypt_ops_list_lock);
if (!found)
return NULL;
return zops; return zops;
} }
@ -359,8 +360,6 @@ struct zcrypt_ops *zcrypt_msgtype_request(unsigned char *name, int variant)
request_module("%s", name); request_module("%s", name);
zops = __ops_lookup(name, variant); zops = __ops_lookup(name, variant);
} }
if ((!zops) || (!try_module_get(zops->owner)))
return NULL;
return zops; return zops;
} }
EXPORT_SYMBOL(zcrypt_msgtype_request); EXPORT_SYMBOL(zcrypt_msgtype_request);