Re: HIFN+IPsec crashes in current -git

Hi Herbert.

On Thu, Feb 21, 2008 at 10:10:13PM +0800, Herbert Xu (herbert@gondor.apana.org.au) wrote:

quoted

Yes by the time the request gets to hifn req->nbytes would have
been decremented by 12 bytes which means that it is now the exact
amount of data that needs to be encrypted.

However, if you follow the scatterlist then you will see more data
available which is normal.

Argh, I see.

Then following patch should help.

Signed-off-by: Evgeniy Polyakov <redacted>

diff --git a/drivers/crypto/hifn_795x.c b/drivers/crypto/hifn_795x.c
index dfbf24c..81b8f2f 100644
--- a/drivers/crypto/hifn_795x.c
+++ b/drivers/crypto/hifn_795x.c

@@ -1544,7 +1544,10 @@ static int ablkcipher_walk(struct ablkcipher_request *req,
 
 			kunmap_atomic(daddr, KM_SOFTIRQ0);
 		} else {
-			nbytes -= src->length;
+			if (src->length > nbytes)
+				nbytes = 0;
+			else
+				nbytes -= src->length;
 			idx++;
 		}