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crypto: ixp4xx - Fix false lastlen uninitialised warning 

This patch fixes a false positive uninitialised variable warning
in aead_perform by moving the source processing in front of the
destination processing, thus ensuring that the initialisation of
lastlen is always visible to gcc.

Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Acked-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Herbert Xu 2016-01-19 09:00:21 +08:00
parent 9dbcc215ad
commit 0f987e25cb
1 changed files with 12 additions and 14 deletions
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26
drivers/crypto/ixp4xx_crypto.c
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@ -1031,6 +1031,18 @@ static int aead_perform(struct aead_request *req, int encrypt,
BUG_ON(ivsize && !req->iv);
memcpy(crypt->iv, req->iv, ivsize);
buf = chainup_buffers(dev, req->src, crypt->auth_len,
&src_hook, flags, src_direction);
req_ctx->src = src_hook.next;
crypt->src_buf = src_hook.phys_next;
if (!buf)
goto free_buf_src;
lastlen = buf->buf_len;
if (lastlen >= authsize)
crypt->icv_rev_aes = buf->phys_addr +
buf->buf_len - authsize;
req_ctx->dst = NULL;
if (req->src != req->dst) {
@ -1055,20 +1067,6 @@ static int aead_perform(struct aead_request *req, int encrypt,
}
}
buf = chainup_buffers(dev, req->src, crypt->auth_len,
&src_hook, flags, src_direction);
req_ctx->src = src_hook.next;
crypt->src_buf = src_hook.phys_next;
if (!buf)
goto free_buf_src;
if (!encrypt || !req_ctx->dst) {
lastlen = buf->buf_len;
if (lastlen >= authsize)
crypt->icv_rev_aes = buf->phys_addr +
buf->buf_len - authsize;
}
if (unlikely(lastlen < authsize)) {
/* The 12 hmac bytes are scattered,
* we need to copy them into a safe buffer */