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generic: fix race on md5 digest computation

This commit is contained in:
Thomas Schoebel-Theuer 2012-09-11 16:35:31 +02:00 committed by Thomas Schoebel-Theuer
parent c1ba96f0a0
commit c124e9d290
1 changed files with 6 additions and 1 deletions
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7
mars_generic.c
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@ -101,7 +101,8 @@ EXPORT_SYMBOL_GPL(mars_timespec_meta);
#include <linux/crypto.h>
struct crypto_hash *mars_tfm = NULL;
static struct crypto_hash *mars_tfm = NULL;
static struct semaphore tfm_sem = __SEMAPHORE_INITIALIZER(tfm_sem, 1);
int mars_digest_size = 0;
EXPORT_SYMBOL_GPL(mars_digest_size);
@ -115,11 +116,15 @@ void mars_digest(unsigned char *digest, void *data, int len)
memset(digest, 0, mars_digest_size);
// TODO: use per-thread instance, omit locking
down(&tfm_sem);
crypto_hash_init(&desc);
sg_init_table(&sg, 1);
sg_set_buf(&sg, data, len);
crypto_hash_update(&desc, &sg, sg.length);
crypto_hash_final(&desc, digest);
up(&tfm_sem);
}
EXPORT_SYMBOL_GPL(mars_digest);