5cd60ff76e2ebc46ccb59115 parent 3b75a2c126c4b573553856e0fe08d1bb020ca8c3 author Herbert Xu 1347336345 +0800 committer Herbert Xu 1347336345 +0800 crypto: authenc - Fix crash with zero-length assoc data The authenc code doesn't deal with zero-length associated data correctly and ends up constructing a zero-length sg entry which causes a crash when it's fed into the crypto system. This patch fixes this by avoiding the code-path that triggers the SG construction if we have no associated data. This isn't the most optimal fix as it means that we'll end up using the fallback code-path even when we could still execute the digest function. However, this isn't a big deal as nobody but the test path would supply zero-length associated data. Reported-by: Romain Francoise Signed-off-by: Herbert Xu Tested-by: Romain Francoise