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crypto: aesni-intel - Don't leak memory in rfc4106_set_hash_subkey

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There's a small memory leak in 
arch/x86/crypto/aesni-intel_glue.c::rfc4106_set_hash_subkey(). If the call 
to kmalloc() fails and returns NULL then the memory allocated previously 
by ablkcipher_request_alloc() is not freed when we leave the function.

I could have just added a call to ablkcipher_request_free() before we 
return -ENOMEM, but that started to look too much like the code we 
already had at the end of the function, so I chose instead to rework the 
code a bit so that there are now a few labels at the end that we goto when 
various allocations fail, so we don't have to repeat the same blocks of 
code (this also reduces the object code size slightly).

Signed-off-by: Jesper Juhl <jj@chaosbits.net>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Jesper Juhl 2011-01-23 18:56:36 +11:00 committed by Herbert Xu
parent 1bae4ce27c
commit 7efd95f627
1 changed files with 9 additions and 8 deletions
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17
arch/x86/crypto/aesni-intel_glue.c
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@ -873,21 +873,19 @@ rfc4106_set_hash_subkey(u8 *hash_subkey, const u8 *key, unsigned int key_len)
crypto_ablkcipher_clear_flags(ctr_tfm, ~0);
ret = crypto_ablkcipher_setkey(ctr_tfm, key, key_len);
if (ret) {
crypto_free_ablkcipher(ctr_tfm);
return ret;
}
if (ret)
goto out;
req = ablkcipher_request_alloc(ctr_tfm, GFP_KERNEL);
if (!req) {
crypto_free_ablkcipher(ctr_tfm);
return -EINVAL;
ret = -EINVAL;
goto out_free_ablkcipher;
}
req_data = kmalloc(sizeof(*req_data), GFP_KERNEL);
if (!req_data) {
crypto_free_ablkcipher(ctr_tfm);
return -ENOMEM;
ret = -ENOMEM;
goto out_free_request;
}
memset(req_data->iv, 0, sizeof(req_data->iv));
@ -913,9 +911,12 @@ rfc4106_set_hash_subkey(u8 *hash_subkey, const u8 *key, unsigned int key_len)
if (!ret)
ret = req_data->result.err;
}
out_free_request:
ablkcipher_request_free(req);
kfree(req_data);
out_free_ablkcipher:
crypto_free_ablkcipher(ctr_tfm);
out:
return ret;
}